Parametric amplifier for Bell measurement in continuous-variable quantum state teleportation

TL;DR

This paper demonstrates that a parametric amplifier can replace beam splitters in continuous-variable quantum teleportation, offering a loss-tolerant alternative that enhances quantum measurement processes.

Contribution

It introduces a novel use of parametric amplifiers in Bell measurements for quantum teleportation, improving loss tolerance over traditional beam splitter methods.

Findings

Parametric amplifier can replace beam splitters in Bell measurements.

The scheme is more loss-tolerant in quantum teleportation.

Enhanced robustness in quantum measurement applications.

Abstract

A parametric amplifier is in essence a linear four-port device, which couples and linearly mixes two inputs before amplifying and sending them to two output ports. Here, we show that for quadrature-phase amplitudes, a parametric amplifier can replace beam splitters to play the role of mixer. We apply this idea to a continuous-variable quantum state teleportation scheme in which a parametric amplifier replaces a beam splitter in Bell measurement. We show that this scheme is loss-tolerant in the Bell measurement process and thus demonstrate the advantage of PA over BS in the applications in quantum measurement.