We propose a definition of fidelity for mixed quantum states in terms of Uhlmann's 'transition probability' formula F(1, 2) = {trace [(√12 ×√1)]} and give new elementary proofs of its essential properties.doi:10.1080/09500349414552171Jozsa...
Applications of quantum technology often require fidelities to quantify performance. These provide a fundamental yardstick for the comparison of two quantum states. While this is straightforward in the case of pure states, it is much more subtle for the more general case of mixed quantum states oft...
Fidelity plays an important role in quantum information processing, which provides a basic scale for comparing two quantum states. At present, one of the most commonly used fidelities is Uhlmann-Jozsa (U-J) fidelity. However, U-J fidelity needs to calcul
We consider imperfect two-mode bosonic quantum transducers that cannot completely transfer an initial source-system quantum state due to insufficient coupling strength or other Hamiltonian non-idealities. We show that such transducers can generically be
System scalability is fundamental for large-scale quantum computers (QCs) and is being pursued over a variety of hardware platforms. For QCs based on trapped ions, architectures such as the quantum charge-coupled device (QCCD) are used to scale the numbe
However, in any experimental implementation the average fidelity between the target and output states cannot be perfect. In order for an RSP experiment to demonstrate genuine quantum advantages, it must surpass the optimal threshold of a comparable classical protocol. Here we study the fidelity ...
We propose a simple scheme for hybrid economical telecloning (HETC) of equatorial qubits with the well-known W-type entangled states. The so-called HETC is... XW Wang,GJ Yang - 《Physical Review A》 被引量: 68发表: 2009年 Techniques for high fidelity quantum teleportation and computing ...
time-evolution of pure states to mixed states is described by Eq. (1). See Ref. 9 for the connection between two ap- proaches. From Eq. (5), quantum teleportation of mixed states reads E(ρ out ) = Tr 1,2U tel E(ρ in
Algorithms for Trace Distance and Fidelity EstimationRanyiliu Chen, 1 Zhixin Song, 1 Xuanqiang Zhao, 1 and Xin Wang 1, *1 Institute for Quantum Computing, Baidu Research, Beijing 100193, China(Dated: November 12, 2021)Estimating the difference between quantum data is crucial in quantum ...
In particular, concurrence is not enough to characterize theentanglement properties of a two-qubit mixed state.Quantum entanglement has remained a major resource foraccomplishing quantum information processing tasks suchas teleportation [1], quantum key distribution [2], secretsharing [3], etc. The ...