Efficient quantum entanglement distribution over an arbitrary collective-noise channel

TL;DR

This paper introduces a deterministic method for distributing maximally entangled photon pairs over noisy channels by converting frequency entanglement into polarization entanglement, leveraging collective noise for improved efficiency.

Contribution

The scheme enables efficient, deterministic entanglement distribution over arbitrary collective-noise channels by using frequency-to-polarization conversion with 100% success probability.

Findings

Achieves deterministic entanglement distribution in noisy channels.

Utilizes frequency degree of freedom to mitigate noise effects.

Employs wavelength division multiplexers and quantum frequency up-conversion.

Abstract

We present an efficient quantum entanglement distribution over an arbitrary collective-noise channel. The basic idea in the present scheme is that two parties in quantum communication first transmit the entangled states in the frequency degree of freedom which suffers little from the noise in an optical fiber. After the two parties share the photon pairs, they add some operations and equipments to transfer the frequency entanglement of pairs into the polarization entanglement with the success probability of 100\%. Finally, they can get maximally entangled polarization states with polarization independent wavelength division multiplexers and quantum frequency up-conversion which can erase distinguishability for frequency. Compared with conventional entanglement purification protocols, the present scheme works in a deterministic way in principle. Surprisingly, the collective noise leads to an additional advantage.