Antoni Wojcik, Andrzej Grudka
We clarify the connections between the erasure scheme of probabilistic CNOT gate implementation recently proposed by Pittman, Jacobs and Franson [Phys. Rev. A 64, 062311 (2001)] and quantum teleportation.
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Quantum teleportation of an elemental silicon nanophotonic CNOT gate
研究首次在硅纳米光子芯片上实验演示了CNOT门的量子隐形传态，利用局域操作与共享纠缠实现了非局域量子门，各项保真度均超83%，为大规模分布式量子计算提供了可扩展路径。
Teleportation of quantum gates is a critical step for implementation of quantum networking and teleportation-based models of quantum computation. We report an experimental demonstration of teleportation of the prototypical quantum controlled-NOT (CNOT) gate. Assisted with linear optical manipulations, photon entanglement produced from parametric down conversion, and coincidence measurements, we teleport the quantum CNOT gate from acting on local qubits to acting on remote qubits. The quality of the quantum gate teleportation is characterized through the method of quantum process tomography, wi…
Chip-to-chip quantum photonic controlled-NOT gate teleportation
本文基于硅光子集成电路实现芯片间高保真度CNOT门隐形传送，在5米和1公里光纤互连下验证了远程量子门操控，为大规模实用化量子网络奠定基础。
Quantum error correcting codes (QECC) are the key ingredients both for fault-tolerant quantum computation and quantum communication. Teleportation-based error correction (TEC) helps in detecting and correcting operational and erasure errors by performing X and Z measurements during teleportation. Here we demonstrate the TEC protocol for the detection and correction of a single bit-flip error by proposing a new quantum circuit. A single phase-flip error can also be detected and corrected using the above protocol. For the first time, we illustrate detection and correction of erasure error in the…
Large-scale quantum computers will require quantum gate operations between widely separated qubits. A method for implementing such operations, known as quantum gate teleportation (QGT), requires only local operations, classical communication, and shared entanglement. We demonstrate QGT in a scalable architecture by deterministically teleporting a controlled-NOT (CNOT) gate between two qubits in spatially separated locations in an ion trap. The entanglement fidelity of our teleported CNOT is in the interval [0.845, 0.872] at the 95% confidence level. The implementation combines ion shuttling wi…
IRIS: A Compiler for Distributed Quantum Systems
本文提出ATHENA编译器，通过引入多候选块调度和EPR容量感知早期调度方法，解决了分布式量子计算机中块级调度的延迟和误差问题，从而显著减少量子门调度的延迟和误差。
Single qubit rotation gate and the controlled-NOT (CNOT) gate constitute a complete set of gates for universal quantum computation. In general the CNOT gate are only for two nearby qubits. For two qubits which are remote from each other, we need a series of swap gates to transfer these two qubits to the nearest neighboring sites, and then after the CNOT gate we should transfer them to their original sites again. However, a series of swap gates are resource for quantum information processing. One economy way which does not consume so much resource is to implement CNOT gate remotely. The remote …
Dual Non-local Cnot gate
本文提出一种高效的双非局域CNOT门实现协议，利用1个纠缠比特和局域操作，通过不保真度分析验证了在噪声低于阈值时能最优实现该门。
Bi-directional quantum teleportation of GHZ-like states
本文提出一种基于四qubit cluster态量子信道的双向量子隐形传态方法，通过CNOT门和Bell态测量实现n-qubit GHZ-like态在用户间的双向传输，并研究了噪声影响及bit-flip错误防护方案。
We propose a practical scheme for deterministically teleporting an arbitrary multipartite state, either product or entangled, using Faraday rotation of the photonic polarization. Our scheme, based on the input-output process of single-photon pulses regarding cavities, works in low-Q cavities and only involves virtual excitation of the atoms, which is insensitive to both cavity decay and atomic spontaneous emission. Besides, the Bell-state measurement is accomplished by the Faraday rotation plus product-state measurements, which could much relax the experimental difficulty to realize the Bell-s…
A Path-Superposition Framework for Quantum Gate Teleportation
介绍基于路径叠加的确定性量子门隐形传态通用框架，通过预共享最大纠缠资源相位和路径依赖局部酉算子指定目标非局部操作，给出设计条件并构建协议，还概述了光子实现方案。
Tunable quantum router with giant atoms, implementing quantum gates, teleportation, non-reciprocity, and circulators
本文研究双轨波导中嵌入巨原子的构型，通过调制波导诱导相位和原子间相互作用相位实现光子定向路由与非互易散射，提出量子存储、CNOT门等量子应用，为量子网络发展提供新方案。
Assisted with linear optical manipulation, single photon, entangled photon pairs, photon measurement, and classical communication, a scheme for two-spin qubits phase gate and teleportation of a CNOT gate between two electron spins from acting on local qubits to acting on remote qubits using quantum dots in optical microcavities is proposed. The scheme is based on spin selective photon reflection from the cavity and is achieved in a deterministic way by the sequential detection of photons and the single-qubit rotations of a single electron spin in a self-assembled GaAs/InAs quantum dot. The fea…
We propose a model based on a generalized effective Hamiltonian for studying the effect of noise in quantum computations. The system-environment interactions are taken into account by including stochastic fluctuating terms in the system Hamiltonian. Treating these fluctuations as Gaussian Markov processes with zero mean and delta function correlation times, we derive an exact equation of motion describing the dissipative dynamics for a system of n qubits. We then apply this model to study the effect of noise on the quantum teleportation and a generic quantum controlled-NOT (CNOT) gate. For the…
Universal logic gates for two quantum bits (qubits) form an essential ingredient of quantum information processing. However, the photons, one of the best candidates for qubits, suffer from the lack of strong nonlinear coupling required for quantum logic operations. Here we show how this drawback can be overcome by reporting a proof-of-principle experimental demonstration of a non-destructive controlled-NOT (CNOT) gate for two independent photons using only linear optical elements in conjunction with single-photon sources and conditional dynamics. Moreover, we have exploited the CNOT gate to di…
A Genetic Approach to Minimising Gate and Qubit Teleportations for Multi-Processor Quantum Circuit Distribution
针对分布式量子计算中逻辑量子比特分配的NP难问题，提出一种同时考虑门与量子比特隐形传态的遗传算法，通过动态重分配优化电路分块，减少EPR对消耗，提升DQC效能与可扩展性，助力全局量子编译器研发。
Error correction of transversal CNOT gates for scalable surface code computation
针对表面码横向CNOT门的关联误差问题，研究提出低复杂度MWPM解码器并测试三种策略，拓展相关电路解码与噪声下的性能比较，为大规模量子算法成本估算奠基。
The distribution of entangled states between distant locations will be essential for the future large scale realization of quantum communication schemes such as quantum cryptography and quantum teleportation. Because of the unavoidable noise in the quantum communication channel, the entanglement between two particles is more and more degraded the further they propagate. Entanglement purification is thus essential to distill highly entangled states from less entangled ones. Existing general purification protocols are based on the quantum controlled-NOT (CNOT) or similar quantum logic operations…
A quantum computer has the potential to effciently solve problems that are intractable for classical computers. Constructing a large-scale quantum processor, however, is challenging due to errors and noise inherent in real-world quantum systems. One approach to this challenge is to utilize modularity--a pervasive strategy found throughout nature and engineering--to build complex systems robustly. Such an approach manages complexity and uncertainty by assembling small, specialized components into a larger architecture. These considerations motivate the development of a quantum modular architect…
Gate Teleportation in Noisy Quantum Networks with the SquidASM Simulator
本文基于 SquidASM 在多节点噪声量子网络中实现双量子比特 Clifford 门与 Toffoli 门的门隐形传态，支持门切割并评估不同噪声下的鲁棒性。
It has previously been shown that probabilistic quantum logic operations can be performed using linear optical elements, additional photons (ancilla), and post-selection based on the output of single-photon detectors. Here we describe the operation of several quantum logic operations of an elementary nature, including a quantum parity check and a quantum encoder, and we show how they can be combined to implement a controlled-NOT (CNOT) gate. All of these gates can be constructed using polarizing beam splitters that completely transmit one state of polarization and totally reflect the orthogona…
Efficient Generation of Multi-partite Entanglement between Non-local Superconducting Qubits using Classical Feedback
本研究借助150 ns反馈延迟的FPGA控制硬件，探索基于隐形传态的协议在超导量子比特间生成非局域多体纠缠的效用，演示了恒定深度下GHZ态、非局域CNOT门、量子扇出门的实现及态隐形传态，发现保真度受闲置量子比特测量诱导退相干限制。
Gate Teleportation vs Circuit Cutting in Distributed Quantum Computing
该研究对比分布式量子计算中门隐形传态与线路切割技术，建模含噪远程门，确定二者性能盈亏平衡点，指出降低M2O换能器噪声10倍可使远程门更具优势，为量子互连硬件指标提供参考。
Logical multi-qubit entanglement with dual-rail superconducting qubits
本研究通过双轨超导量子比特实现了逻辑多量子比特纠缠，展示了高保真度的纠缠态和通用门集，为量子纠错提供了新方案。
In principle the Zeno effect controlled-sign gate of Franson et al's (PRA 70, 062302, 2004) is a deterministic two-qubit optical gate. However, when realistic values of photon loss are considered its fidelity is significantly reduced. Here we consider the use of measurement based quantum processing techniques to enhance the operation of the Zeno gate. With the help of quantum teleportation, we show that it is possible to achieve a Zeno CNOT gate (GC-Zeno gate) that gives (near) unit fidelity and moderate probability of success of 0.76 with a one-photon to two-photon transmission ratio $κ=10^4$…
Optimal joint cutting of two-qubit rotation gates
本文基于虚拟门隐形传态协议提出双量子比特旋转门的最优联合切割方案，显著降低采样开销上界，并证明无需经典通信，同时给出并行旋转门的最优无辅助分解。
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