44 citations · 207 across the 20 of their papers we have counts for
20 papers
High-fidelity geometric quantum gates exceeding 99.9% in germanium quantum dots
Yu-Chen Zhou, Rong-Long Ma, Zhenzhen Kong +11
Achieving high-fidelity and robust qubit manipulations is a crucial requirement for realizing faulttolerant quantum computation. Here, we demonstrate a single-hole spin qubit in a…
Universal Robust Quantum Gates via Doubly Geometric Control
Hai Xu, Tao Chen, Junkai Zeng +5
Geometric quantum computation offers a potential route to fault-tolerant quantum information processing by exploiting the global nature of geometric phases. However, achieving cont…
Multiple-Noise-Resilient Nonadiabatic Geometric Quantum Control of Solid-State Spins in Diamond
Si-Qi Chen, Qi-Tao Duan, Chengxian Zhang +1
Reliable and robust control lies at the core of implementing quantum information processing with diamond nitrogen-vacancy (NV) centers. However, control pulses inevitably introduce…
Dynamically Optimized Super-Robust Nonadiabatic Holonomic Quantum Gates Based on Superconducting Circuits
Hai Xu, Wanchun Li, Tao Chen +2
Nonadiabatic holonomic quantum computation (NHQC) leverages non-Abelian geometric phases within a nonadiabatic framework to achieve fast and robust quantum gate operations. However…
Geometric two-qubit gates in silicon-based double quantum dots
Yong-Yang Lu, Kejin Wei, Chengxian Zhang
Achieving high-fidelity two-qubit gates is crucial for spin qubits in silicon double quantum dots. However, the two-qubit gates in experiments are easily suffered from charge noise…
Improved security bounds against the Trojan-Horse attack in decoy-state quantum key distribution
Zijian Li, Bingbing Zheng, Chengxian Zhang +3
In a quantum Trojan-horse attack (THA), eavesdroppers learn encoded information by injecting bright light into encoded or decoded devices of quantum key distribution (QKD) systems.…
Single spin qubit geometric gate in a silicon quantum dot
Rong-Long Ma, Ao-Ran Li, Chu Wang +11
Preserving qubit coherence and maintaining high-fidelity qubit control under complex noise environment is an enduring challenge for scalable quantum computing. Here we demonstrate…
Universal Robust Geometric Quantum Control via Geometric Trajectory Correction
Tao Chen, Jia-Qi Hu, Chengxian Zhang +1
Universal robust quantum control is essential for performing complex quantum algorithms and efficient quantum error correction protocols. Geometric phase, as a key element with int…
Experimental study of secure quantum key distribution with source and detection imperfections
Ye Chen, Chunfeng Huang, Zihao Chen +4
The quantum key distribution (QKD), guaranteed by the principle of quantum physics, is a promising solution for future secure information and communication technology. However, dev…
Optimizing nonadiabatic geometric quantum gates against off-resonance error by dynamical correction in a silicon-based spin qubit
Liu-Jun Guo, Hai Xu, Zi-Yu Fang +3
Geometric quantum gates are performed by using the geometric phase, making them particularly robust to the pulse amplitude error due to the intrinsic global property. However, in m…
Fast high-fidelity geometric gates for singlet-triplet qubits
Mei-Ya Chen, Chengxian Zhang, Zheng-Yuan Xue
Geometric gates that use the global property of the geometric phase is believed to be a powerful tool to realize fault-tolerant quantum computation. However, for singlet-triplet qu…
Universal singlet-triplet qubits implemented near the transverse sweet spot
Wen-Xin Xie, Chengxian Zhang, Zheng-Yuan Xue
The key to realizing fault-tolerant quantum computation for singlet-triplet (ST) qubits in semiconductor double quantum dot (DQD) is to operate both the single- and two-qubit gates…
Coupling two charge qubits via a superconducting resonator operating in the resonant and dispersive regimes
Chengxian Zhang, Guo Xuan Chan, Xin Wang +1
A key challenge for semiconductor quantum-dot charge qubits is the realization of long-range qubit coupling and performing high-fidelity gates based on it. Here, we describe a new…
Implementation of geometric quantum gates on microwave-driven semiconductor charge qubits
Chengxian Zhang, Tao Chen, Xin Wang +1
A semiconductor-based charge qubit, confined in double quantum dots, can be a platform to implement quantum computing. However, it suffers severely from charge noises. Here, we pro…
High-fidelity geometric gate for silicon-based spin qubits
Chengxian Zhang, Tao Chen, Sai Li +2
High-fidelity manipulation is the key for the physical realization of fault-tolerant quantum computation. Here, we present a protocol to realize universal nonadiabatic geometric ga…
Spin-qubit noise spectroscopy from randomized benchmarking by supervised learning
Chengxian Zhang, Xin Wang
We demonstrate a method to obtain the spectra of noises in spin-qubit devices from randomized benchmarking, assisted by supervised learning. The noise exponent, which indicat…
Leakage and sweet spots in triple-quantum-dot spin qubits: A molecular-orbital study
Chengxian Zhang, Xu-Chen Yang, Xin Wang
A triple-quantum-dot system can be operated as either an exchange-only qubit or a resonant-exchange qubit. While it is generally believed that the decisive advantage of the resonan…
Fast pulse sequences for dynamically corrected gates in single-triplet qubits
Robert E. Throckmorton, Chengxian Zhang, Xu-Chen Yang +3
We present a set of experimentally feasible pulse sequences that implement any single-qubit gate on a singlet-triplet spin qubit and demonstrate that these new sequences are up to…
Randomized benchmarking of barrier versus tilt control of a singlet-triplet qubit
Chengxian Zhang, Robert E. Throckmorton, Xu-Chen Yang +3
Decoherence due to charge noise is one of the central challenges in using spin qubits in semiconductor quantum dots as a platform for quantum information processing. Recently, it h…
Benchmarking of dynamically corrected gates for the exchange-only spin qubit in noise environment
Chengxian Zhang, Xu-Chen Yang, Xin Wang
We study theoretically the responses of the dynamically corrected gates to time-dependent noises in the exchange-only spin qubit system. We consider noises having spectra pro…