Fidelity Criterion for Quantum-Domain Transmission and Storage of Coherent States Beyond the Unit-Gain Constraint

2007/03/31 by Ryo Namiki, Masato Koashi, Nobuyuki Imoto · 4 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum optics and atomic interactions #quant-ph

paper · pdf · doi:10.1103/physrevlett.101.100502

published as Phys. Rev. Lett. 101, 100502 (2008). · 4pages, No figures, Accepted for publication in PRL

arxiv created 2008/08/11 · openalex publication_date 2008/09/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We generalize the experimental success criterion for quantum teleportation (memory) in continuous-variable quantum systems to be suitable for a non-unit-gain condition by considering attenuation (amplification) of the coherent-state amplitude. The new criterion can be used for a nonideal quantum memory and long distance quantum communication as well as quantum devices with amplification process. It is also shown that the framework to measure the average fidelity is capable of detecting all Gaussian channels in the quantum domain.

Citations

• Entanglement Breaking Channels
• Experimental demonstration of quantum memory for light
• Non-Gaussian Cloning of Quantum Coherent States is Optimal
• Quantum limits on noise in linear amplifiers

Cited by

• Simple proof of the quantum benchmark fidelity for continuous-variable quantum devices
• Measurement schemes for the spin quadratures on an ensemble of atoms
• Quantum benchmarks for the storage or transmission of quantum light from minimal resources
• Efficient Verification of Continuous-Variable Quantum States and Devices without Assuming Identical and Independent Operations