68 citations · 190 across the 27 of their papers we have counts for
28 papers · 1 filter
Entanglement detection in dynamical quantum systems
Xingjian Zhang, Jiayi Wu, Jue Xu +1
Quantum science and engineering increasingly target the exploitation and control of large-scale dynamical systems. As system size grows, novel phenomena and quantum advantages emer…
Exponential speedup of polarization stabilization for long distance DWDM quantum networks
Jinyi Du, En Teng Lim, Xingjian Zhang +4
Fibre-based quantum networks distributing polarization entanglement require a stable and uninterrupted transmission basis for reliable operation. Bright classical reference light e…
Size-Independent Robustness in Multipartite Bell Self-Testing
Shen Cao, Xingjian Zhang, Fei Shi +1
Practical robust self-testing of multipartite entanglement has so far been restricted to small-scale systems due to error bounds that degrade severely with system size. In this wor…
Broadband characterization of polarization mode dispersion for quantum communication channels
Vadim Rodimin, Konstantin Kravtsov, Rui Ming Chua +5
We present a method for characterizing depolarization in fiber channels carrying broadband polarization-encoded optical signals. Wavelength-dependent polarization mode dispersion (…
Worst-case depth hierarchy for shallow quantum circuits
Min-Hsiu Hsieh, Michael de Oliveira, Sathyawageeswar Subramanian +1
Circuit depth is a central resource in complexity theory. While bounded-depth classical circuits admit well-understood hierarchy theorems, the internal structure of constant-depth…
Stream randomness extraction against quantum side information
Chun-Yang Luan, Cheng-Kang Pan, Xiang Zhang +1
Randomness extraction is indispensable for quantum random number generators, serving to eliminate bias and potential information leakage from raw measurement data. Conventional ext…
Scalable self-testing of generic multipartite quantum states
Jinchang Liu, Elias X. Huber, Zhenyu Du +2
Characterizing large quantum systems with minimal assumptions is a central challenge in quantum information science. Self-testing provides the strongest form of certification by id…
Distilling the knowledge with quantum neural networks
Yuxuan Yan, Sitian Qian, Qi Zhao +1
Quantum Neural Networks (QNNs) are a promising class of quantum machine learning models with potential quantum advantages when implemented on scalable, error-corrected quantum comp…
A building block of quantum repeaters for scalable quantum networks
Wen-Zhao Liu, Ya-Bin Zhou, Jiu-Peng Chen +26
Quantum networks, integrating quantum communication, quantum metrology, and distributed quantum computing, could provide secure and efficient information transfer, high-resolution…
Entanglement Superactivation in Multiphoton Distillation Networks
Rui Zhang, Yue-Yang Fei, Zhenhuan Liu +9
In quantum networks, after passing through noisy channels or information processing, residual states may lack sufficient entanglement for further tasks, yet they may retain hidden…
Interplay of Quantum Resources in Nonlocality Tests
Hai-Hao Dong, Yuwei Zhu, Su-Yi Cheng +8
Nonlocality, evidenced by the violation of Bell inequalities, not only signifies entanglement but also highlights measurement incompatibility in quantum systems. Utilizing the gene…
Advantage Distillation for Quantum Key Distribution
Zhenyu Du, Guoding Liu, Xingjian Zhang +1
Quantum key distribution promises information-theoretically secure communication, with data post-processing playing a vital role in extracting secure keys from raw data. While hard…
Unconditional quantum magic advantage in shallow circuit computation
Xingjian Zhang, Zhaokai Pan, Guoding Liu
Quantum theory promises computational speed-ups over classical approaches. The celebrated Gottesman-Knill Theorem implies that the full power of quantum computation resides in the…
Virtual Channel Purification
Zhenhuan Liu, Xingjian Zhang, Yue-Yang Fei +1
Quantum error mitigation is a key approach for extracting target state properties on state-of-the-art noisy machines and early fault-tolerant devices. Using the ideas from flag fau…
Pilot-reference-free continuous-variable quantum key distribution with efficient decoy-state analysis
Anran Jin, Xingjian Zhang, Liang Jiang +2
Continuous-variable quantum key distribution (CV QKD) using optical coherent detectors is practically favorable due to its low implementation cost, flexibility of wavelength divisi…
Interplay among entanglement, measurement incompatibility, and nonlocality
Yuwei Zhu, Xingjian Zhang, Xiongfeng Ma
Nonlocality, manifested by the violation of Bell inequalities, indicates entanglement within a joint quantum system. A natural question is how much entanglement is required for a g…
Improved Real-time Post-Processing for Quantum Random Number Generators
Qian Li, Xiaoming Sun, Xingjian Zhang +1
Randomness extraction is a key problem in cryptography and theoretical computer science. With the recent rapid development of quantum cryptography, quantum-proof randomness extract…
Certifying randomness in quantum state collapse
Liang-Liang Sun, Xingjian Zhang, Xiang Zhou +4
The unpredictable process of state collapse caused by quantum measurements makes the generation of quantum randomness possible. In this paper, we explore the quantitive connection…
Intrinsic randomness under general quantum measurements
Hao Dai, Boyang Chen, Xingjian Zhang +1
Quantum measurements can produce randomness arising from the uncertainty principle. When measuring a state with von Neumann measurements, the intrinsic randomness can be quantified…
Classically Replaceable Operations
Guoding Liu, Xingjian Zhang, Xiongfeng Ma
Quantum information science provides powerful technologies beyond the scope of classical physics. In practice, accurate control of quantum operations is a challenging task with cur…
Experimental refutation of real-valued quantum mechanics under strict locality conditions
Dian Wu, Yang-Fan Jiang, Xue-Mei Gu +11
Physicists describe nature using mathematics as the natural language, and for quantum mechanics, it prefers to use complex numbers. However, whether complex numbers are really nece…
Device-Independent-Quantum-Randomness-Enhanced Zero-Knowledge Proof
Cheng-Long Li, Kai-Yi Zhang, Xingjian Zhang +15
Zero-knowledge proof (ZKP) is a fundamental cryptographic primitive that allows a prover to convince a verifier of the validity of a statement without leaking any further informati…
Stream privacy amplification for quantum cryptography
Yizhi Huang, Xingjian Zhang, Xiongfeng Ma
Privacy amplification is the key step to guarantee the security of quantum communication. The existing security proofs require accumulating a large number of raw key bits for priva…
Quantum Complementarity Approach to Device-Independent Security
Xingjian Zhang, Pei Zeng, Tian Ye +2
Complementarity is an essential feature of quantum mechanics. The preparation of an eigenstate of one observable implies complete randomness in its complementary observable. In qua…