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Quantum repeater using two-mode squeezed states and atomic noiseless amplifiers

Anders J. E. Bjerrum*, Jonatan B. Brask, Jonas S. Neergaard-Nielsen, and Ulrik L. Andersen

  • Center for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark

  • *Corresponding author: ajebje@dtu.dk
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Phys. Rev. A 107, 042606 – Published 12 April, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.042606

Abstract

We perform a theoretical investigation into how a two-mode squeezed vacuum state, which 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.

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Information

Phys. Rev. A 107, 042606– Published 12 April, 2023
  • Received 29 November 2022
  • Accepted 13 March 2023
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