Zheng-Yuan Xue, You-Min Yi, Zhuo-Liang Cao
We investigate economic protocol to securely distribute and reconstruct a single-qubit quantum state between two users via a tripartite entangled state in cavity QED. Our scheme is insensitive to both the cavity decay and the thermal field.
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We investigate economic protocol to securely encoding classical information among three users via entangled GHZ states. We implement the scheme in cavity QED with atomic qubits where the atoms interact simultaneously with a highly detuned cavity mode with the assistance of a classical field. The scheme is insensitive to the cavity decay and the thermal field, thus based on cavity QED techniques presently it might be realizable.
Chirality-assisted enhancement of tripartite entanglement in waveguide QED
本研究探讨了手性波导中量子发射器间的三部分纠缠，发现手性可提升纠缠最大值35%并延长维持时间，为量子网络与长距离通信提供新途径。
We propose an experimental setup, feasible with present day technology, involving two highquality- factor cavities, one Ramsey zone and a two-level atom which interacts with them. The dynamics in the cavities is modeled by a dissipative dispersive Jaynes-Cummings model. Analytical expresions for the evolution superoperator in each part of the proposed setup and for the concurrence between the atom and the first cavity are given, and the pairwise entanglement of the subsystems is calculated numerically. We consider initial separable states given by the tensor product of a superposition of the t…
We describe the transfer of quantum information and entanglement from three flying (radiation) to three localized (atomic) qubits via cavity modes resonantly coupled to the atoms, in the presence of a common reservoir. Upon addressing the full dynamics of the resulting nine-qubit open system, we find that once the cavities are fed, fidelity and transferred entanglement are optimal, while their peak values exponentially decrease due to dissipative processes. The external radiation is then turned off and quantum correlations oscillate between atomic and cavity qubits. For a class of mixtures of …
We present a fully analytical solution of the dynamics of two strongly-driven atoms resonantly coupled to a dissipative cavity field mode. We show that an initial atom-atom entanglement cannot be increased. In fact, the atomic Hilbert space divides into two subspaces, one of which is decoherence free so that the initial atomic entanglement remains available for applications, even in presence of a low enough atomic decay rate. In the other subspace a measure of entanglement, decoherence, and also purity, are described by a similar functional behavior that can be monitored by joint atomic measur…
We present a proposal to produce bipartite and tripartite entanglement in a hybrid magnon-cavity QED system. Two macroscopic yttrium iron garnet (YIG) spheres are coupled to a single-mode microwave cavity via magnetic dipole interaction, while the cavity photons are generated via the two photon process induced by a pump field. Using the mean field theory, we show that the second order nonlinearity can result in strong bipartite entanglement between cavity photons and magnonic modes under two conditions, i.e., $δ_c δ_{m}=2g^2$ and $δ_c=-δ_{m}$. For the later one, we also show the possibility fo…
Genuine tripartite entanglement in Bhabha scattering with an entangled spectator particle
研究入射电子与正电子Bhabha散射中，初始与旁观电子纠缠的正电子如何通过QED散射驱动全局系统产生真三体纠缠，并利用纠缠度量表征其生成机制与单配性约束。
Hybrid systems that combine spin ensembles and superconducting circuits provide a promising platform for implementing quantum information processing. We propose a non-Hermitian magnoncircuit-QED hybrid model consisting of two cavities and an yttrium iron garnet (YIG) sphere placed in one of the cavities. Abundant exceptional points (EPs), parity-time (PT )-symmetry phases and PT -symmetry broken phases are investigated in the parameter space. Tripartite highdimensional entangled states can be generated steadily among modes of the magnon and photons in PT -symmetry broken phases, corresponding …
We present a way for implementing an n-qubit controlled-rotation gate with three-level superconducting qubit systems in cavity QED. The two logical states of a qubit are represented by the two lowest levels of each system while a higher-energy level is used for the gate implementation. The method operates essentially by preparing a $W$ state conditioned on the states of the control qubits, creating a single photon in the cavity mode, and then performing an arbitrary rotation on the states of the target qubit with assistance of the cavity photon. It is interesting to note that the basic operati…
Tripartite Entanglement Generation in Atom-Coupled Dual Microresonators System
研究由两个线性耦合单模谐振器与一个二能级原子组成的混合腔量子电动力学系统中真正三方纠缠的产生与控制，通过弱驱动下的解析框架和三方并发度表征参数区域，并展示耗散率和失谐不对称性如何调控从二分纠缠到真正三方态的转换。
Genuine Tripartite Strong Coupling in a Superconducting-Spin Hybrid Quantum System
该研究在超导-自旋混合量子系统中实现了真实三体强耦合，展示了多光子跃迁和核自旋相互作用，为复杂多组分动力学研究提供了新平台。
By exploiting a system of three distant cavities, we propose a scheme for constructing tripartite entangled coherent GHZ and W states which are robust due to the photon losses in the cavities. Each of cavities is doped with a semiconductor quantum dot. By the dynamics, the excitonic modes of quantum dots are enabled to exhibit entan-gled coherent GHZ and W states. Apart from the exciton losses, the master equation approach shows that when the populations of the field modes in the cavities are negli-gible the destruction of entanglement due to decoherence arises from photon losses, is effective…
Many molecular, quantum-dot, and optomechanical nanocavity-QED systems demonstrate strong nonlinear interactions between electrons, photons, and phonon (vibrational) modes. We show that such systems can be described by a universal model in the vicinity of the nonlinear parametric resonance involving all three degrees of freedom. We solve the nonperturbative quantum dynamics in the strong coupling regime of the nonlinear resonance, taking into account quantization, dissipation, and fluctuations of all fields. We find analytic solutions for quantum states in the rotating wave approximation which…
We propose a scheme to generate entanglement between two cavity modes and squeeze magnon mode in a magnon-cavity QED system, where the two microwave cavity modes are coupled with a massive yttrium iron garnet (YIG) sphere through magnetic dipole interaction. The nonlinearity used in our system originates from a squeezed driving via parametric down-conversion process, which is the reason to cause entanglement and squeezing. By using the mean field approximation and employing experimentally feasible parameters, we demonstrate that the system shows zero entanglement and squeezing without squeezed…
We propose a many-qubit network with cavity QED by encoding qubits in decoherence-free subspace, based on which we can implement many-logic-qubit conditional gates by means of cavity assisted interaction with single-photon pulses. Our scheme could not only resist collective dephasing errors, but also much reduce the implementational steps compared to conventional methods doing the same job, and we can also complete communications between two arbitrary nodes. We show the details by implementing a three-logic-qubit Toffoli gate, and explore the experimental feasibility and challenge based on cur…
We propose an effective set of elementary quantum gates which provide an encoded universality and demonstrate the physical feasibility of these gates for the solid-state quantum computer based on the multi-atomic systems in the QED cavity. We use the two-qubit encoding and swapping-based operations to simplify a physical realization of universal quantum computing and add the immunity to a number of errors. This approach allows to implement any encoded single-qubit operation by three elementary gates and the encoded controlled- NOT operation can be performed in a single step. The considerable a…
We investigate the feasibility of implementing an elementary building block for quantum information processing. The combination of a deterministic single photon source based on vacuum stimulated adiabatic rapid passage, and a quantum memory based on electromagnetically induced transparency in atomic vapour is outlined. Both systems are able to produce and process temporally shaped wavepackets which provides a way to maintain the indistinguishability of retrieved and original photons. We also propose an efficient and robust `repeat-until-success' quantum computation scheme based on this hybrid …
Distributed quantum computation requires to apply quantum remote gates on separate nodes or subsystems of network. On the other hand, Toffoli gate is a universal and well-known quantum gate. It is frequently used in synthesis of quantum circuits. In this paper, a general protocol for implementing a remote n-qubit controlled-U gate is presented with minimum required resources. Then, the proposed method is applied for implementing a Toffoli gate in bipartite and tripartite systems. This method also is optimal when group of the qubits belong to one part, section or subsystem of network. Because i…
We present a scheme for implementing the unconventional geometric two-qubit phase gate with nonzero dynamical phase by using the two-channel Raman interaction of two atoms in a cavity. We show that the dynamical phase acquired in a cyclic evolution is proportional to the geometric phase acquired in the same cyclic evolution, hence the the total phase possesses the same geometric features as the geometric phase. In our scheme the atomic excited state is adiabatically eliminated and the operation of the proposed logic gate involves only in the metastable states of the atom and hence is not affec…
Enantiodetection in a cavity QED setup with finite chiral molecules
该研究通过监测腔QED平台的稳态腔内光子数，利用对映体固有全局π相位差设计干涉路径，结合广义离散截断维格纳近似，实现误差低于5%的对映体过量直接读出，为实际量子光学环境中的对映体检测铺路。
Coherent control of quantum states is at the heart of implementing solid-state quantum processors and testing quantum mechanics at the macroscopic level. Despite significant progress made in recent years in controlling single- and bi-partite quantum systems, coherent control of quantum wave function in multipartite systems involving artificial solid-state qubits has been hampered due to the relatively short decoherence time and lacking of precise control methods. Here we report the creation and coherent manipulation of quantum states in a tripartite quantum system, which is formed by a superco…
Temperature-related single-photon transport in waveguide QED
本文提出波导–原子耦合热库的方案，通过温度调控单光子反射与输运，并借助输运测量实现高灵敏度低温估计，为低温光学温度计提供新思路。
The unique features of quantum theory offer a powerful new paradigm for information processing. Translating these mathematical abstractions into useful algorithms and applications requires quantum systems with significant complexity and sufficiently low error rates. Such quantum systems must be made from robust hardware that can coherently store, process, and extract the encoded information, as well as possess effective quantum error correction (QEC) protocols to detect and correct errors. Circuit quantum electrodynamics (cQED) provides a promising hardware platform for implementing robust qua…
Optimal cavity design for minimizing errors in cavity-QED-based atom-photon entangling gates with finite temporal duration
该研究针对有限光子脉冲时长下基于腔QED的原子-光子纠缠门误差问题，解析推导了可同时最小化光子损耗与时间模式失配误差的腔参数关系，还通过数值模拟研究了短脉冲下的脉冲畸变影响，首次提出腔存在最优长度，为量子信息处理实现提供指导。
We analyse the problem of a single mode field interacting with a pair of two level atoms. The atoms enter and exit the cavity at different times. Instead of using constant coupling, we use time dependent couplings which represent the spatial dependence of the mode. Although the system evolution is adiabatic for most of the time, a previously unstudied energy crossing plays a key role in the system dynamics when the atoms have a time delay. We show that conditional atom-cavity entanglement can be generated, while for large photon numbers the entangled system has a behaviour which can be mapped …
This paper investigates a novel hybrid cavity QED-optomechanics situation. We solve the Hamiltonian problem of a cavity coupled both to a two-level atom via a Jaynes-Cummings coupling and to a mechanical motion via radiation pressure coupling. The atom-cavity polariton number operator commutes with the total Hamiltonian leading to an exact analytical solution involving tripartite atom-cavity-mechanics polarons. Under optical pumping of polaronic transitions the system displays unusual atom-assisted cooling and amplification of mechanical motion. We demonstrate the possibility to obtain enhance…
Tripartite hybrid quantum systems: Skyrmion-mediated quantum interactions between single NV centers and superconducting qubits
提出一种由磁性skyrmion、NV中心和超导量子比特组成的三方混合量子系统，利用skyrmion的量子化旋转模式作为中介，实现了单量子水平上NV中心与超导量子比特间的强耦合、相干信息传递和非互易响应。
Loophole-free Bell-inequality violation between atomic states in cavity-QED systems mediated by hybrid atom-light entanglement
本文提出了一种可行的可扩展方法，通过混合原子光纠缠在腔基架构中测试贝尔非局域性并实现设备无关量子密钥分发，结合噪声源模型展示了当前技术可实现强贝尔不等式违反和数十公里的密钥生成。
Cavity quantum electrodynamics (QED), wherein a quantum emitter is coupled to electromagnetic cavity modes, is a powerful platform for implementing quantum sensors, memories, and networks. However, due to the fundamental tradeoff between gate fidelity and execution time, as well as limited scalability, the use of cavity-QED for quantum computation was overtaken by other architectures. Here, we introduce a new element into cavity-QED - a free charged particle, acting as a flying qubit. Using free electrons as a specific example, we demonstrate that our approach enables ultrafast, deterministic …
We present a proposal for implementing quantum phase gates using selective interactions. We analize selectivity and the possibility to implement these gates in two particular systems, namely, trapped ions and Cavity QED.
We present a method of implementing ultrafast two-qubit gates valid for the ultrastrong coupling (USC) and deep strong coupling (DSC) regimes of light-matter interaction, considering state-of-the-art circuit quantum electrodynamics (QED) technology. Our proposal includes a suitable qubit architecture and is based on a four-step sequential displacement of an intracavity mode, operating at a time proportional to the inverse of the resonator frequency. Through ab initio calculations, we show that these quantum gates can be performed at subnanosecond time scales, while keeping the fidelity above 9…
Multi-emitter oscillating bound states in Waveguide QED
本研究通过波导量子电动力学平台，揭示了多发射体振荡束缚态的形成机制及其在非局部平衡态中的动态行为。
Nonreciprocal routing induced by chirality in an atom-dimer waveguide-QED system
本文提出了一种在波导-量子电动力学系统中实现单光子路由器的方案，通过手性耦合操控单光子传输，在非马尔可夫条件下实现按需单光子传输。
We propose a scheme for implementing quantum algorithms with resonant interactions. Our scheme only requires resonant interactions between two atoms and a cavity mode, which is simple and feasible. Moreover, the implementation would be an important step towards the fabrication of quantum computers in cavity QED system.
Hardware-native quantum phase estimation with circuit QED
提出一种利用电路量子电动力学（cQED）的迭代量子相位估计协议，通过二进制阈值测试和同质测量实现海森堡极限精度，无需逆量子傅里叶变换，降低了硬件复杂度。
Qubit-Boson Hybrid Beam-Splitter Gate with Kerr Nonlinearity in Circuit QED for Many-Body Dynamics
研究在电路量子电动力学中引入含克尔非线性的量子比特-玻色子混合分束器门，从cQED模型推导相互作用并获解析表达式，以碳纳米管电路QED为平台模拟验证，该混合原语为多体动力学提供构建块及新联系。
We present a circuit construction for a new fixed-frequency superconducting qubit and show how it can be scaled up to a grid with strictly local interactions. The circuit QED realization we propose implements $σ_z$-type coupling between a superconducting qubit and any number of $LC$ resonators. The resulting \textit{longitudinal coupling} is inherently different from the usual $σ_x$-type \textit{transverse coupling}, which is the one that has been most commonly used for superconducting qubits. In a grid of fixed-frequency qubits and resonators with a particular pattern of always-on interaction…
In this paper, we propose two general entanglement distillation protocols, which can concentrate the non-maximally entangled pure W class state. The general protocols are mainly based on the unitary transformation on the auxiliary particle and one of the three entangled particles, and in the second protocol, the entanglement distillation includes two meanings, namely, extracting the concentrated tripartite entangled W state and obtaining the maximally entangled bipartite state from the garbage state, which gives no contribution to the distillation of non-maximally entangled pure W class state.…
We propose a realizable circuit QED architecture for engineering states of a superconducting resonator off-resonantly coupled to an ancillary superconducting qubit. The qubit-resonator dispersive interaction together with a microwave drive applied to the qubit gives rise to a Kerr resonator with two-photon driving that enables us to efficiently engineer the quantum state of the resonator such as generation of the Schrodinger cat states for resonator-based universal quantum computation. Moreover, the presented architecture is easily scalable for solving optimization problem mapped into the Isin…
Floquet Engineering and Harnessing Giant Atoms in Frequency-Comb Emission and Bichromatic Correlations in Waveguide QED
本文通过动态调制量子比特阵列实现频率可控单光子发射，生成偶宇称或反斯托克斯边带频率梳，扩展波导QED至手性非局域架构，支持高维纠缠态生成及多光子动力学高效模拟，推动频率编码量子信息处理与多体模拟。
The driven-damped Jaynes-Cummings model in the regime of strong coupling is found to exhibit a coexistence between the quantum photon blockaded state and a quasi-coherent bright state. We characterize the slow time scales and the basin of attraction of these metastable states using full quantum simulations. This form of bistability can be useful for implementing a qubit readout scheme that does not require additional circuit elements. We propose a coherent control sequence that makes use of a simple linear chirp of drive amplitude and frequency as well as qubit frequency. By optimizing the par…
Fault-tolerant logical state construction based on cavity-QED network
提出基于CQED网络的容错量子计算架构，利用中性原子稳定性和网络灵活性实现表面码，并通过定制解码算法利用辅助光子丢失信息，将错误阈值显著提升，所需内部协同度降至常规方法的1/5。
Engineering multiphoton states is an outstanding challenge with applications in multiple fields, such as quan- tum metrology, quantum lithography or even biological systems. State-of-the-art methods to obtain them rely on post-selection, multi-level systems or Rydberg atomic ensembles. Recently, it was shown that a strongly driven two-level system interacting with a detuned cavity mode can be engineered to continuously emit n-photon states. In the present work, we show that spectral filtering of its emission relaxes considerably the requirements on the system parameters even to the more access…
Magnomechanically controlled Goos-Hänchen shift in cavity QED
本文研究腔磁振子力学系统中反射探测场的Goos-Hänchen位移，发现可通过磁振子-声子耦合和有效腔失谐相干控制，并在特定耦合条件下增强，对微波开关和传感有潜在应用价值。
Autonomous Code Migration for Quantum Programming Languages: A Case Study with QED-C Benchmarks
本文以QED-C基准测试从Qiskit到CUDA-Q的自主迁移为案例，测试Opus、GPT、Gemini模型的迁移能力，发现多智能体集成策略可缓解量子软件迁移挑战，相关技能能大幅降低模型交互轮次和令牌使用量。
Cavity QED is a versatile tool to explore small scale quantum information processing. Within this setting, we describe a particular protocol for implementing a Toffoli gate with Rydberg atoms and a cavity field. Our scheme uses both resonant and non resonant interactions, and in particular a cavity assisted atomic collision. The experimental feasibility of the protocol is carefully analyzed with the help of numerical simulations and takes into account the decoherence process. Moreover, we show that our protocol is optimal within the constraints imposed by the experimental setting.
A highly feasible dressed-state scheme, which greatly speeds up the adiabatic population transfer of a quantum system, is applied for implementing a fast CNOT gate in a cavity QED system. The cavity QED system consists of two identical five-level atoms which are respectively trapped in two optical cavities connected by a fiber. With the help of quantum Zeno dynamics, the CNOT gate is constructed by three steps with six pulses. Because the adiabatic condition is not necessary to be considered and all of the pulses are smoothly turned on and off, the scheme is fast and feasible in experiment. Nu…
One-dimensional photonic wire as a single-photon source: Implications of cavity QED to a phonon bath of reduced dimensionality
本文研究一维圆柱纳米线中量子点与多支纵向声子的线性及二次耦合，推导出纯退相干速率的解析表达式，并证明多模耦合对准确预测光子不可区分性至关重要。
Manipulation of diverse quantum correlations based on a hybrid optomagnomechanical system
本文提出利用混合光磁机械系统生成和操控量子纠缠与引导，通过调整激光极化方向和Tavis-Cummings耦合强度，实现选择性生成双粒子和真实三粒子纠缠，并确定性操控双粒子、多粒子引导和集体五粒子引导。
A single Yb atom is loaded into a high-finesse optical cavity with a moving lattice, and its nuclear spin state is manipulated using a nuclear magnetic resonance technique. A highly reliable quantum state control with fidelity and purity greater than 0.98 and 0.96, respectively, is confirmed by the full quantum state tomography; a projective measurement with high speed (500us) and high efficiency (0.98) is accomplished using the cavity QED technique. Because a hyperfine coupling is induced only when the projective measurement is operational, the long coherence times (T_1 = 0.49 s and T_2 = 0.1…
Extended Josephson junction qubit system
本文提出基于扩展约瑟夫森结的电路QED架构，利用单个结内多个非线性等离激元模式实现多量子比特相互作用与独立寻址，并可用于单双比特门及通过多模波导耦合模拟广义Bose-Hubbard模型和拓扑相。
Protocols for inter-module two-qubit gates mediated by time-bin encoded photons
提出由 Fock 态或时间仓光子介导的模块间长程双量子比特门协议，并证明在非马尔可夫体制下损耗可预告且反作用近似消除。
Scalable and modular generation of multipartite entangled states through memory-enhanced fusion
针对大规模多体纠缠态生成的挑战，本文提出利用光子互连实现内存增强的纠缠态融合，通过异步制备和单光子干涉成功创建并验证了远程量子内存模块间的四体W态纠缠，为分布式量子信息处理铺路。
Steady-State Emission of Quantum-Correlated Light in the Telecom Band from a Single Atom
该研究提出通过调控激光频率和腔模耦合，实现单个原子稳态发射量子相关电信波段光，并验证其在腔量子电动力学系统中的可行性。
We propose an efficient scheme to implement a multiplex-controlled phase gate with multiple photonic qubits simultaneously controlling one target photonic qubit based on circuit quantum electrodynamics (QED). For convenience, we denote this multiqubit gate as MCP gate. The gate is realized by using a two-level coupler to couple multiple cavities. The coupler here is a superconducting qubit. This scheme is simple because the gate implementation requires only \textit{one step} of operation. In addition, this scheme is quite general because the two logic states of each photonic qubit can be encod…
Cavity Quantum Electrodynamics in Finite-Bandwidth Squeezed Reservoir
研究有限带宽压缩真空驱动下的参数驱动腔QED模型，揭示相对带宽与压缩效应对反交叉谱及增强协作度的影响，并分析谐振器缺陷导致的光子损耗实用性，提出在InAs量子点腔QED等固态平台实现有效压缩库的实验要求。
Sequential quantum simulation of spin chains with a single circuit QED device
本文提出用单个transmon-腔cQED器件顺序构建MPS来模拟自旋链基态，利用腔的大状态空间存储纠缠，并通过模拟脉冲控制显著缩短制备时间、降低退相干影响，为简化量子处理器设计提供新途径。
Equivocation-resistant multiparty digital signature for quantum networks
该研究提出基于预共享密钥和通用哈希的抗歧义签名（ERS）协议，可扩展至任意接收方，经测试其密钥消耗、签名大小远优于现有量子数字签名方案，且在量子城域网现场测试中表现优异。
Quantum Simulation of QED in Coulomb Gauge
本文提出了一种在位置空间中基于场基组的量子算法，用于高效模拟库仑规范下的量子电动力学，显著降低了计算成本。
Quantum Error Detection For Early Term Fault-Tolerant Quantum Algorithms
本文研究量子错误检测在早期容错量子计算中的实用价值，提出基于 [[n, n-2, 2]] 码的容错编译与仿真框架，通过优化综合征调度使算法成功概率平均提升 6.7 倍，并给出数据驱动的参数预测方法，为浅层算法提供恒定开销的错误缓解方案。
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