Quantum Communications with Compressed Decoherence Using Bright Squeezed Light

TL;DR

This paper introduces a quantum communication scheme using bright squeezed light pulses to establish high-fidelity entanglement over long distances without purification, achieving 0.99 fidelity at 10 km with a 34% success rate.

Contribution

It presents a novel method employing bright squeezed light and weak dispersive interactions for efficient long-distance quantum entanglement distribution.

Findings

Fidelity of 0.99 achieved at 10 km distance

Success probability of 0.34 for entanglement generation

Utilizes squeezed light and homodyne detection without purification

Abstract

We propose a scheme for long-distance distribution of quantum entanglement in which the entanglement between qubits at intermediate stations of the channel is established by using bright light pulses in squeezed states coupled to the qubits in cavities with a weak dispersive interaction. The fidelity of the entanglement between qubits at the neighbor stations (10 km apart from each other) obtained by postselection through the balanced homodyne detection of 7 dB squeezed pulses can reach F=0.99 without using entanglement purification, at same time, the probability of successful generation of entanglement is 0.34.