Fidelity criterion for quantum-domain transmission and storage of coherent states beyond unit-gain constraint

Abstract

We generalize the experimental success criterion for quantum teleportation/memory in continuous-variable quantum systems to be suitable for non-unit-gain condition by considering attenuation/amplification of the coherent-state amplitude. The new criterion can be used for a non-ideal 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 quantum domain.

4pages, No figures, Accepted for publication in PRL

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Cited by in corpus (14)

• Efficient verification of continuous-variable quantum states and devices without assuming identical and independent operations
• Verification of quantum-domain process using two non-orthogonal states
• Probing the quantumness of channels with mixed states
• Quantum benchmarking with realistic states of light
• Fundamental quantum limits for practical devices
• Continuous-variable quantum state designs: theory and applications
• Simple proof of the quantum benchmark fidelity for continuous-variable quantum devices
• Optimal asymptotic cloning machines
• Schmidt-number benchmark for genuine quantum memories and gates
• Quantum Benchmark via an Uncertainty Product of Canonical Variables
• Robust Gaussian Teleportation with Attenuations and Non-unity Gain
• Averaged fidelity-based steering criteria
• Quantum Minimax Theorem
• Security against collective attacks for a continuous-variable quantum key distribution protocol using homodyne detection and postselection