Faithful qubit transmission against collective noise without ancillary qubits

TL;DR

This paper introduces a linear-optics-based scheme for faithful qubit transmission over noisy channels without using ancillary qubits, achieving perfect fidelity and high success probability, suitable for quantum communication.

Contribution

The scheme is simpler and more feasible than previous methods, using only linear optical components and no ancillary qubits, with guaranteed fidelity against collective noise.

Findings

Fidelity of 1 for successful transmission, independent of noise parameters.

Success probability can reach 100% with time delayers.

Applicable to one-way quantum communication to reject collective noise errors.

Abstract

We present a faithful qubit transmission scheme with linear optics against collective noise, not resorting to ancillary qubits. Its set-up is composed of three unbalanced polarization interferometers, based on a polarizing beam splitter, a beam splitter and a half-wave plate, which makes this scheme more feasible than others with present technology. The fidelity of successful transmission is 1, independent of the parameters of the collective noise, and the success probability for obtaining an uncorrupted state can be improved to 100% with some time delayers. Moreover, this scheme has some good applications in one-way quantum communication for rejecting the errors caused by the collective noise in quantum channel.