Quantum Repeater using Two-Mode Squeezed States and Atomic Noiseless Amplifiers

TL;DR

This paper proposes a theoretical method for enhancing entanglement in quantum communication by using noiseless amplification with solid-state qubits, aiming to improve quantum repeaters and long-distance quantum key distribution.

Contribution

It introduces a novel approach combining two-mode squeezed states with solid-state qubits for probabilistic entanglement enhancement and quantum repeater construction.

Findings

Probabilistic increase of entanglement using noiseless amplification.

Implementation of a state transfer from optical modes to solid-state qubits.

Potential applications in quantum repeaters and long-distance quantum key distribution.

Abstract

We perform a theoretical investigation into how a two-mode squeezed vacuum state, that has undergone photon loss, can be stored and purified using noiseless amplification with a collection of solid-state qubits. The proposed method may be used to probabilistically increase the entanglement between the two parties sharing the state. The proposed amplification step is similar in structure to a set of quantum scissors. However, in this work the amplification step is realized by a state transfer from an optical mode to a set of solid-state qubits, which act as a quantum memory. We explore two different applications, the generation of entangled many-qubit registers, and the construction of quantum repeaters for long-distance quantum key distribution.