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Quantum Algorithm for Reversing Unknown Unitary Evolutions
Yu-Ao Chen, Yin Mo, Yingjian Liu +2
Reversing an unknown quantum evolution is of central importance to quantum information processing and fundamental physics, yet it remains a formidable challenge as conventional met…
Efficient Inversion of Unknown Unitary Operations with Structured Hamiltonians
Yin Mo, Tengxiang Lin, Xin Wang
Unknown unitary inversion is a fundamental primitive in quantum computing and physics. Although recent work has demonstrated that quantum algorithms can invert arbitrary unknown un…
Sample-Efficient Estimation of Nonlinear Quantum State Functions
Hongshun Yao, Yingjian Liu, Tengxiang Lin +1
Efficient estimation of nonlinear functions of quantum states is crucial for various key tasks in quantum computing, such as entanglement spectroscopy, fidelity estimation, and fea…
Parameterized quantum comb and simpler circuits for reversing unknown qubit-unitary operations
Yin Mo, Lei Zhang, Yu-Ao Chen +3
Quantum combs play a vital role in characterizing and transforming quantum processes, with wide-ranging applications in quantum information processing. However, obtaining the expli…
Protocols and Trade-Offs of Quantum State Purification
Hongshun Yao, Yu-Ao Chen, Erdong Huang +3
Quantum state purification is crucial in quantum communication and computation, aiming to recover a purified state from multiple copies of an unknown noisy state. This work introdu…