量子干涉计算机：一个实验方案

在NMR量子计算机上实现对模型的量子模拟

Proposal of Quantum Simulation of Pairing Model on an NMR Quantum Computer

提出了一种在NMR量子计算机上对配对模型进行量子模拟的方案。在我们的建议中，我们选择了一个合适的初始状态，可以很容易地在实验中制备。利用核磁共振测量的特点和二次（离散）傅立叶变换技术，我们的理论方案在原理上可以得到配对模型的谱。具体讨论了配对模型中有关子空间的情况，并以一个简单的初始态为例，求出了该子空间中两个最低能级的能级差。类似地，能够讨论获得更多能级差异的量子模拟。

Proposal for an interference experiment to test the applicability of quantum theory to event-based processes

We analyze a single-particle Mach-Zehnder interferometer experiment in which the path length of one arm may change (randomly or systematically) according to the value of an external two-valued variable $x$, for each passage of a particle through the interferometer. Quantum theory predicts an interference pattern that is independent of the sequence of the values of $x$. On the other hand, corpuscular models that reproduce the results of quantum optics experiments carried out up to this date show a reduced visibility and a shift of the interference pattern depending on the details of the sequenc…

将量子计算机求解旅行商问题所需的量子比特数从 $n^2$ 降至 $n\log_{2}(n)$：一项在 NISQ 时代展示量子优越性的提案

Reducing the Number of Qubits from $n^2$ to $n\log_{2} (n)$ to Solve the Traveling Salesman Problem with Quantum Computers: A Proposal for Demonstrating Quantum Supremacy in the NISQ Era

本文提出基于 QAOA 的 TSP 求解方法，将量子比特需求由 $n^2$ 降至 $n\log_{2}(n)$，并在既有指标上表现更优，为 NISQ 时代实现量子优越性提供路径。

Proposal for a quantum delayed-choice experiment with a spin-mechanical setup

We describe an experimentally feasible protocol for performing a variant of the quantum delayed-choice experiment with massive objects. In this scheme, a single nitrogen-vacancy (NV) center in diamond driven by microwave fields is dispersively coupled to a massive mechanical resonator. A double-pulse Ramsey interferometer can be implemented with the spin-mechanical setup, where the second Ramsey microwave pulse drives the spin conditioned on the number states of the resonator. The probability for finding the NV center in definite spin states exhibits interference fringes when the mechanical re…

The Universe and The Quantum Computer

It is first pointed out that there is a common mathematical model for the universe and the quantum computer. The former is called the histories approach to quantum mechanics and the latter is called measurement based quantum computation. Although a rigorous concrete model for the universe has not been completed, a quantum measure and integration theory has been developed which may be useful for future progress. In this work we show that the quantum integral is the unique functional satisfying certain basic physical and mathematical principles. Since the set of paths (or trajectories) for a qua…

Scalable Neutral Atom Quantum Computer with Interaction on Demand: Proposal for Selective Application of Two-Qubit Gate

We propose a scalable neutral atom quantum computer with an on-demand interaction through a selective two-qubit gate operation. Atoms are trapped by a lattice of near field Fresnel diffraction lights so that each trap captures a single atom. One-qubit gate operation is implemented by a gate control laser beam which is applied to an individual atom. Two-qubit gate operation between an arbitrary pair of atoms is implemented by sending these atoms to a state-dependent optical lattice and making them collide so that a particular two-qubit state acquires a dynamical phase. We give numerical evaluat…

在量子计算机上模拟量子光子学

Modelling quantum photonics on a quantum computer

本文提出在量子计算机上构建光学器件的“量子副本”以替代传统方程建模，并以薄吸收膜量子干涉实验为例，在IBM超导量子比特上精确复现了完全吸收与完全透射现象，展示了该方法在复杂多光子光学建模中的潜力。

Heralded entanglement of two distant quantum dot spins via optical interference

We present a proposal for heralded entanglement between two quantum dots via Hong--Ou--Mandel effect. Each of the quantum dots, drived off-resonance by two lasers, can be entangled with the coherent cavity mode. The output photons from the two coherent cavity modes interfering by a beamsplitter, we could entangle the two QDs with nearly unit success probability. Our scheme requires neither direct coupling between qubits nor the detection of single photons. Moreover the quantum dots do not need to have the same frequencies and coupling constants.

Double-Slit Interference Pattern for a Macroscopic Quantum System

In this study, we solve analytically the Schrodinger equation for a macroscopic quantum oscillator as a central system coupled to two environmental micro-oscillating particles. Then, the double-slit interference patterns are investigated in two limiting cases, considering the limits of uncertainty in the position probability distribution. Moreover, we analyze the interference patterns based on a recent proposal called stochastic electrodynamics with spin. Our results show that when the quantum character of the macro-system is decreased, the diffraction pattern becomes more similar to a classic…

Hong-Ou-Mandel干涉的数字量子模拟

Digital Quantum Simulations of Hong-Ou-Mandel Interference

本文利用格雷码实现玻色子到量子比特的映射，构建分束器量子电路，并在量子模拟器与真实量子后端上复现Hong-Ou-Mandel干涉。

Controlled interference of association paths in the conversion of ultracold atoms into molecules

We present a proposal for controlling the conversion of ultracold atoms into molecules by fixing the phase difference between two oscillating magnetic fields. The scheme is based on the use of a magnetic Feshbach resonance with a field modulation that incorporates terms oscillating with frequencies corresponding to the main resonance and one of the subharmonics. The interference between the two association processes activated by the oscillating terms is controlled via the phase difference. As a result, significant increase or decrease of the effective interaction strength can be achieved. The …

一种无路径干涉的光量子控制非门的实现

Demonstration of an optical quantum controlled-NOT gate without path interference

我们首次在实验上实现了无光路干涉的光量子控制非门，其中两个相互作用的光路干涉仪（Phys.Rev.A { \bf 66}，024308（2001），Phys.Rev.A { \bf 65}，012314（2002））已经被具有合适的偏振相关透射率和反射率的三个部分偏振分束器所代替。使用最近提出的方法（Phys. Rev. Lett. { \bf 94}，160504（2005）），通过该方法可以从两个经典真值表的32个测量结果估计量子过程保真度和纠缠能力，显著少于全量子层析成像所需的256个测量结果。

Atom-Mechanical Hong-Ou-Mandel Interference

Quantum coupling between mechanical oscillators and atomic gases generating entanglement has been recently experimentally demonstrated using their subsequent interaction with light. The next step is to build a hybrid atom-mechanical quantum gate showing bosonic interference effects of single quanta in the atoms and oscillators. We propose an experimental test of Hong-Ou-Mandel interference between single phononic excitation and single collective excitation of atoms using the optical connection between them. A single optical pulse is sufficient to build a hybrid quantum-nondemolition gate to ob…

Holographic quantum imaging: reconstructing spatial properties via two-particle interference

Two particle interference phenomena, such as the Hong-Ou-Mandel effect, are a direct manifestation of the nature of the symmetry properties of indistinguishable particles as described by quantum mechanics. The Hong-Ou-Mandel effect has recently been applied as a tool for pure state tomography of a single photon. In this article, we generalise the method to extract additional information for a pure state and extend this to the full tomography of mixed states as well. The formalism is kept general enough to apply to both boson and fermion based interferometry. Our theoretical discussion is accom…

硅基量子计算机Kane模型的单自旋态探测

Single Spin State Detection for the Kane Model of Silicon-Based Quantum Computer

提出了基于单电子旋转门和磁性金属接触注入自旋极化电子测量单自旋（或少自旋）系统态的方案。讨论了最近关于基于硅矩阵的自旋门的建议（B.Kane，Nature，{ \bf 393}，133（1998））的应用。

A proposal for a feasible quantum-optical experiment to test the validity of the No-Signaling Theorem

Motivated by a proposal from Greenberger [Physica Scripta T76, p.57 (1998) ] for superluminal signaling, and inspired by an experiment from Zou, Wang, and Mandel [Phys. Rev. Lett. 67, p.318 (1991) ] showing interference effects within multi-particle entanglement without coincidence detection, we propose a feasible quantum-optical scheme that purports to manifest the capacity for superluminal transfer of information between distant parties

通过无环路 Andreev 干涉仪对 Aharonov-Bohm 效应进行局域性检验的提案

Proposal for locality test of Aharonov-Bohm effect via Andreev interferometer without a loop

本文提出用无环路 Andreev 干涉仪检验 Aharonov-Bohm 效应的量子非局域性，通过比较局域规范不变拉格朗日量与标准基于势的模型，发现独立源单电荷干涉可区分二者，从而判定动力学非局域性。

独立光子的实验干涉

Experimental interference of independent photons

来自独立光源的光子的干涉对于现代量子信息处理方案是必不可少的，尤其是量子中继器和线性光学量子计算机。我们报告了两个单光子的非经典干涉的观察，这两个单光子来自两个独立的，分离的光源，这是积极同步的r.m.s. 260 fs的定时抖动。由此产生的（双光子）干涉可见度为83（+/-）4%。

一种耦合超导量子干涉器件的n量子比特控制相位门

A n-qubit controlled phase gate with superconducting quantum interference devices coupled to a resonator

提出了一种利用超导量子干涉器件（SQUID）实现$n$ -量子比特控制相位门的方法。在这个提议中，量子比特的两个逻辑状态由SQUID的两个最低级别表示。利用每个SQUID的中间级来促进量子位的量子态的相干控制和操纵。值得注意的是，通过在目标SQUID上的$π$ Jaynes-Cummings脉冲之前和之后向每个$n-1$控制SQUID连续施加$π/2$ Jaynes-Cummings脉冲，可以用$n$ SQUID实现$n$量子位控制相位门。

使用凸插值改进NISQ计算机上VQE解决投资组合优化的可训练性

Improving the trainability of VQE on NISQ computers for solving portfolio optimization using convex interpolation

本文利用凸插值改进变分量子本征求解器（VQE）的可训练性，通过近解初始化、正则代价函数景观和递归拟设平衡分区策略，在仅用10个超导量子比特实现40量子比特实验，并融合贪心算法实现全局与局部优化的互补。

A silicon-based cluster state quantum computer

It has been over ten years since Kane's influential proposal for a silicon-based nuclear spin quantum computer using phosphorous donors. Since then, silicon-based architectures have been refined as the experimental challenges associated with the original proposal have become better understood, while simultaneously a number of powerful and generic models for quantum computation have emerged. Here, I discuss how the cluster state or "one-way" model for quantum computing might be advantageously applied to donors in silicon, with the potential to substantially reduce the practical requirements of …

Simulation of wave-particle duality in multi-path interferometers on a quantum computer

We present an architecture to investigate wave-particle duality in $N$-path interferometers on a universal quantum computer involving as low as $2\log N$ qubits and develop a measurement scheme which allows the efficient extraction of quantifiers of interference visibility and which-path information. We implement our algorithms for interferometers with up to $N=16$ paths in proof-of-principle experiments on a noisy intermediate-scale quantum (NISQ) device using down to $\mathcal{O}(\log N)$ gates and despite increasing noise consistently observe a complementary behavior between interference vi…

Enantiomer superpositions from matter-wave interference of chiral molecules

Molecular matter-wave interferometry enables novel strategies for manipulating the internal mechanical motion of complex molecules. Here, we show how chiral molecules can be prepared in a quantum superposition of two enantiomers by far-field matter-wave diffraction and how the resulting tunnelling dynamics can be observed. We determine the impact of ro-vibrational phase averaging and propose a setup for sensing enantiomer-dependent forces, parity-violating weak interactions, and environment-induced superselection of handedness, as suggested to resolve Hund's paradox. Using ab-initio tunnelling…

Quantum logical gates with four-level SQUIDs coupled to a superconducting resonator

We propose a way for realizing a two-qubit controlled phase gate with superconducting quantum interference devices (SQUIDs) coupled to a superconducting resonator. In this proposal, the two lowest levels of each SQUID serve as the logical states and two intermediate levels of each SQUID are used for the gate realization. We show that neither adjustment of SQUID level spacings during the gate operation nor uniformity in SQUID parameters is required by this proposal. In addition, this proposal does not require the adiabatic passage or a second-order detuning and thus the gate is much faster.

微扰量子色动力学中散射振幅与干涉的量子模拟

Quantum simulation of scattering amplitudes and interferences in perturbative QCD

本文提出利用量子计算机直接模拟QCD中费曼图的颜色部分，运动学部分经典预计算，在56量子比特离子阱量子计算机上验证，为全量子模拟微扰QCD迈出关键一步。

用于量子计算机的格林函数电路微分框架

A circuit-differentiation framework for Green's functions on quantum computers

本文提出一种在量子计算机上计算 retarded 格林函数的框架，通过将评估转化为电路微分问题，利用电路扰动直接表示外部扰动力，展示了两种随机估计器方法，并在相互作用自旋和费米模型中验证了动态相关性的准确性。

量子计算机、因子分解和退相干

Quantum Computers, Factoring, and Decoherence

在量子计算机中，输入的任何叠加都统一地演化为相应的输出叠加。最近已经证明，这种计算机可以显着加快寻找大数因子的任务-一个具有重大实际意义的问题，因为它的密码应用。最快的经典算法所需的近似指数（$\sim \exp L^{1/3}$，对于具有$L$数字的数字）时间，量子算法给出了$L$（$\sim L^2$）中时间多项式的因子。这种巨大的加速在原则上是可能的，因为量子计算可以同时遵循与不同经典输入相对应的所有路径，作为备选方案之间相干量子干涉的结果获得解决方案。因此，量子计算机是复杂的干涉装置，并且其量子态在操作过程中保持相干是必不可少的。在这份报告中，我们研究了退相干对量子因子分解算法的影响，并根据每个操作步骤所遭受的退相干，建立了一个"量子因子分解“$L$的上限。

Entanglement generation and manipulation in the Hong-Ou-Mandel experiment: A hidden scenario beyond two-photon interference

Hong-Ou-Mandel (HOM) effect was long believed to be a two-photon interference phenomenon. It describes the fact that two indistinguishable photons mixed at a beam splitter will bunch together to one of the two output modes. Considering the two single-photon emitters such as trapped ions, we explore a hidden scenario of the HOM effect, where entanglement can be generated between the two ions when a single photon is detected by one of the detectors. A second photon emitted by the entangled photon sources will be subsequently detected by the same detector. However, we can also control the fate of…

在混合量子比特–振荡器量子计算机上实时观测 $\mathbb{Z}_2$ 晶格规范理论中的 Aharonov–Bohm 干涉

Real-Time Observation of Aharonov-Bohm Interference in a $\mathbb{Z}_2$ Lattice Gauge Theory on a Hybrid Qubit-Oscillator Quantum Computer

该研究在混合量子比特–振荡器囚禁离子器件上编码 $\mathbb{Z}_2$ 晶格规范理论，结合数字与模拟技术实现规范不变实时演化，并首次在动力学规范场中观测到准二维 Aharonov–Bohm 干涉。

A proposal for measuring photon temporal coherence in continuum radiation

A technique complementary to those for spectral lines is proposed for the observation of continuum radiation. As, quantum mechanically, the radiation is a mixture of pure states, it should be possible to measure the temporal coherence of the states as a function of energy. We propose here experiments with just this possibility, showing the empirical grounds on which it is based. A simple means of measuring temporal coherence is with the extent of the interference pattern produced in a Young's double-slit experiment. Thus, we propose the use of such an experiment, but with a screen of energy me…

Observation of quantum interference as a function of Berry's phase in a complex Hadamard optical network

Emerging models of quantum computation driven by multi-photon quantum interference, while not universal, may offer an exponential advantage over classical computers for certain problems. Implementing these circuits via geometric phase gates could mitigate requirements for error correction to achieve fault tolerance while retaining their relative physical simplicity. We report an experiment in which a geometric phase is embedded in an optical network with no closed-loops, enabling quantum interference between two photons as a function of the phase.

Quantum Eraser Using A Modified Stern-Gerlach Setup

We propose a new setup to demonstrate quantum eraser, using spin-1/2 particles in a modified Stern-Gerlach setup, with a double slit. The "which-way" information can be erased simply by applying a transverse magnetic field with an additional magnet, resulting in the emergence of two complementary staggered interference patterns. Use of the classic Stern-Gerlach setup, and the unweaving of the washed out interference without any coincident counting, is what makes this proposal novel.

Apparent quantum paradoxes as simple interference: Quantum violation of the pigeonhole principle and exchange of properties between quantum particles

It was recently argued that the pigeonhole principle, which states that if three pigeons are put into two pigeonholes then at least one pigeonhole must contain more than one pigeon, is violated in quantum systems [Y. Aharonov et al., PNAS 113, 532 (2016)]. An experimental verification of this effect was recently reported [M.-C. Chen et al., PNAS 116, 1549 (2019)]. In another recent experimental work, it was argued that two entities were observed to exchange properties without meeting each other [Z.-H. Liu et al., Nat. Commun. 11, 3006 (2020)]. Here we describe all these proposals and experimen…

使用超导电荷量子比特的可扩展量子计算机

Scalable quantum computer using superconducting charge qubits

提出了一种利用一维超导传输线谐振器（STLR）作为数据总线的超导电荷量子比特的可扩展方案。通过控制超导电荷量子比特的栅极电压和外加磁通量，可以实现量子比特与数据总线的耦合。在我们的方案中，任意两个量子比特和三个量子比特的$W$态之间的纠缠可以快速而容易地产生。

一种利用光子晶体耦合腔波导实现量子门的方案

A proposal for the implementation of quantum gates with photonic-crystal coupled cavity waveguides

量子计算机需要的技术既能对相干量子现象提供足够的控制，又能将与环境的虚假相互作用降到最低。我们表明，光子局限于光子晶体，特别是高效的波导形成的线性链的缺陷掺杂原子可以产生强的非线性相互作用，允许实现单和两个量子位量子门。门开关机制的简单性、制作二维光子晶体结构的实验可行性以及这种器件与光电子学的可集成性为光学量子信息处理网络提供了新的有趣的可能性。

A double-slit proposal for quantum annealing

We formulate and analyze a double-slit proposal for quantum annealing, which involves observing the probability of finding a two-level system (TLS) undergoing evolution from a transverse to a longitudinal field in the ground state at the final time $t_f$. We demonstrate that for annealing schedules involving two consecutive diabatic transitions, an interference effect is generated akin to a double-slit experiment. The observation of oscillations in the ground state probability as a function of $t_f$ (before the adiabatic limit sets in) then constitutes a sensitive test of coherence between ene…

大脑作为量子计算机

Brain as quantum-like computer

我们提出了一个在物理学，认知科学和心理学中的量子表示的上下文统计现实模型。我们应用这个模型来描述认知实验，以检查心理过程的量子结构。关键的作用是由概率对心理可观察性的干扰所起的。最近进行了一个基于图像识别的这样的实验。这个实验证实了我们对心灵量子行为的预测。在我们的方法中，“心灵的量子性”与大脑（和任何物质身体一样）是由量子粒子组成的事实没有直接关系。我们发明了一个新的术语“类量子（QL）思维”。认知QL行为的特征在于非零干扰系数$λ.$。该系数可以在统计数据的基础上找到。不仅预测了概率的$\cos θ$-干扰，而且预测了双曲线$\cosh θ$-干扰。物理系统从未观察到这种干扰，但我们不能排除认知系统的这种可能性。我们提出了一个大脑作为QL计算机的模型（讨论了量子计算机和QL计算机之间的差异）。

一台简单的量子计算机

A Simple Quantum Computer

我们提出了一个量子计算机的实现来解决Deutsch的问题，这需要在经典计算机上的指数时间，但只有线性时间与量子并行。通过使用双轨量子比特表示作为一种简单的纠错形式，我们的机器可以容忍一定量的退相干，并且仍然以很高的概率给出正确的结果。我们采用的设计也展示了量子并行性的签名，它明确地描绘了所需的量子行为，从仅仅是经典的。使用量子光学元件对我们的建议进行实验演示，需要开发单光子学的几个关键技术。

K-Means Clustering on Noisy Intermediate Scale Quantum Computers

Real-time clustering of big performance data generated by the telecommunication networks requires domain-specific high performance compute infrastructure to detect anomalies. In this paper, we evaluate noisy intermediate-scale quantum (NISQ) computers characterized by low decoherence times, for K-means clustering and propose three strategies to generate shorter-depth quantum circuits needed to overcome the limitation of NISQ computers. The strategies are based on exploiting; i) quantum interference, ii) negative rotations and iii) destructive interference. By comparing our implementations on I…

RISQ -精简指令集量子计算机

RISQ - reduced instruction set quantum computers

仅提供有限控制的量子计算的候选者，例如，由于缺乏对单个量子位的访问，对于通用量子计算是无用的。我们提出了具体的建议，使用系统的限制，如RISQ -减少指令集量子计算机和设备-模拟量子动力学，多粒子纠缠和压缩集体自旋变量。这些任务本身就很有用，它们也为量子门在量子计算机的早期原型中的功能提供了实验探针。

Quantum random number generation enhanced by weak-coherent states interference

We propose and demonstrate a technique for quantum random number generation based on the random population of the output spatial modes of a beam splitter when both inputs are simultaneously fed with indistinguishable weak coherent states. We simulate and experimentally validate the probability of generation of random bits as a function of the average photon number per input, and compare it to the traditional approach of a single weak coherent state transmitted through a beam-splitter, showing an improvement of up to 32\%. The ensuing interference phenomenon reduces the probability of coinciden…

量子计算机模型与退相干问题

Models of Quantum Computers and Decoherence Problem

描述了多维量子图灵机和量子线路等量子计算机的数学模型，讨论了它与晶格自旋模型的关系。如果想要建造量子计算机，必须解决的主要开放问题之一是由于与环境耦合而引起的退相干。我们提出了一个可能的解决方案，这个问题通过使用控制系统的参数。这个建议是基于随机极限近似下自旋玻色子哈密顿量的分析。

核自旋量子比特间距为100 nm的半导体量子计算机设计

Semiconductor quantum computer design with 100 nm separation of nuclear-spin qubits

我们结合了Privman、Vagner和Kventsel以及Kane在1998年提出的量子计算方案中的元素，以及通过杂质原子的束缚外层电子间接介导的核自旋量子比特相互作用的新思想，杂质原子的核自旋1/2是量子比特。这些电子又通过二维电子气以量子霍尔效应方式相互作用。由此产生的量子计算方案保留了凯恩提议的所有门控和测量方面，但允许量子比特间隔在100 nm量级的距离，这是用当今的异质结器件技术可以实现的。

作为量子计算机的全球可控人工半导体分子

Globally controlled artificial semiconducting molecules as quantum computers

预计量子计算机在执行某些特定任务时比经典计算机效率高得多。这些计算机实际实现的困难在于建立一个可以在更大的介观尺度上控制的微观量子系统。在这里，我展示了嵌入适当的氧化锌半导体结构中的施主原子的垂直线可以构成人工分子，这些分子是相同量子计算机的许多副本。在这种可扩展的架构中，每个信息单元都被编码到供体的电子自旋上。与大多数现有的实际建议相反，这里的逻辑运算只需要通过电磁脉冲对自旋进行全局控制。环绕测量简化了读数。只要适当改进其生长和掺杂方法，氧化锌有望成为下一代计算机的良好半导体材料。

A proposal for direct measurement on the quantum geometric potential

The quantum geometric potential is a gauge invariant carrying novel geometric features between any two energy levels or bands in quantum systems. In generic time-dependent systems it gives a vital physical modification for the instantaneous energy gaps, laying down more appropriate quantum adiabatic conditions for both non-degenerate and degenerate systems. Remarkably, for generic parameterized quantum systems, the integration of the quantum geometric potential on a closed loop leads to a novel type of quantized winding number, which is a quantum counterpart of the Gauss-Bonnet theorem. The ef…

Dephasing and inhibition of spin interference from semi-classical self-gravitation

We present a detailed derivation of a model to study effects of self-gravitation from semi-classical gravity, described by the Schrödinger-Newton equation, employing spin superposition states in inhomogeneous magnetic fields, as proposed recently for experiments searching for gravity induced entanglement. Approximations for the experimentally relevant limits are discussed. Results suggest that spin interferometry could provide a more accessible route towards an experimental test of quantum aspects of gravity than both previous proposals to test semi-classical gravity and the observation of gra…

A scalable quantum computer with an ultranarrow optical transition of ultracold neutral atoms in an optical lattice

We propose a new quantum-computing scheme using ultracold neutral ytterbium atoms in an optical lattice. The nuclear Zeeman sublevels define a qubit. This choice avoids the natural phase evolution due to the magnetic dipole interaction between qubits. The Zeeman sublevels with large magnetic moments in the long-lived metastable state are also exploited to address individual atoms and to construct a controlled-multiqubit gate. Estimated parameters required for this scheme show that this proposal is scalable and experimentally feasible.

原子量子计算机

Atomic Quantum Computer

目前实现量子计算机如核磁共振、量子点和囚禁离子的方案都是基于使用一个原子或离子作为一个量子比特。在这些提议中，量子计算机由几个原子组成，它们之间的耦合提供了量子门所需的量子位之间的耦合。我们讨论了{ \it单}原子能否用作量子计算机。原子的内部态用于保存量子信息，而自旋-轨道和自旋-自旋相互作用提供了原子量子计算机中量子比特之间的耦合。特别地，可以使用电子自旋共振（ESR）来处理在原子能级的超精细分裂中编码的信息。通过使用量子态工程，人们可以操纵天然或人造（量子点）原子的内部状态来进行量子计算。

利用确定性过程模拟量子干涉的新方法及其在基于事件的量子计算模拟中的应用

New method to simulate quantum interference using deterministic processes and application to event-based simulation of quantum computation

我们证明了具有原始学习能力的局部连接处理单元的网络表现出通常只归因于量子系统的行为。我们描述的网络，模拟单光子分束器和马赫-曾德尔干涉仪实验的因果关系，事件的基础上，并证明，模拟结果与量子理论非常一致。我们还表明，这种方法可以推广到模拟通用量子计算机。

Demonstration of the trapped-ion quantum-CCD computer architecture

The trapped-ion QCCD (quantum charge-coupled device) architecture proposal lays out a blueprint for a universal quantum computer. The design begins with electrodes patterned on a two-dimensional surface configured to trap multiple arrays of ions (or ion crystals). Communication within the ion crystal network allows for the machine to be scaled while keeping the number of ions in each crystal to a small number, thereby preserving the low error rates demonstrated in trapped-ion experiments. By proposing to communicate quantum information by moving the ions through space to interact with other di…

量子核评估：基于Hong-Ou-Mandel干涉

Quantum Kernel Evaluation via Hong-Ou-Mandel Interference

本文提出并模拟了利用Hong-Ou-Mandel干涉评估量子核的协议，通过单光子正交时间模式编码多维特征，实现直接测量与二元分类，并展示了指数级量子优势。

用于Kane固态量子计算机的非绝热控制Not门

A Non-Adiabatic Controlled Not Gate for the Kane Solid State Quantum Computer

利用迭代预解式的方法得到了Kane固态量子计算机中相邻量子比特的有效哈密顿量。与凯恩提议中固有的绝热门过程相反，我们表明，由这种有效的哈密顿量产生的量子比特-量子比特系统的自由演化，结合单个量子比特操作，足以产生受控非（c-NOT）门。因此，通常的通用门的集合可以在凯恩量子计算机上获得，而不需要如凯恩所规定的可控参数的绝热切换。通过数值模拟确定了这种非绝热c-NOT门的保真度和门时间。

量子博弈在单向量子计算机上的实验实现

Experimental realization of a quantum game on a one-way quantum computer

我们报告了在全光单向量子计算机上的量子博弈的第一个演示。根据最近的理论建议，我们实现了量子版本的囚徒困境，其中量子线路是由一个4-qubit盒簇配置和玩家的本地策略，通过对簇的物理量子位进行测量来实现的。这个演示强调了单向模型的强度和多功能性，我们预计这将引发人们对设计量子协议和算法的进一步兴趣，这些协议和算法将在最先进的集群资源中进行测试。

Quantum Computational Supremacy

The field of quantum algorithms aims to find ways to speed up the solution of computational problems by using a quantum computer. A key milestone in this field will be when a universal quantum computer performs a computational task that is beyond the capability of any classical computer, an event known as quantum supremacy. This would be easier to achieve experimentally than full-scale quantum computing, but involves new theoretical challenges. Here we present the leading proposals to achieve quantum supremacy, and discuss how we can reliably compare the power of a classical computer to the po…