Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams

J. Agustí, Y. Minoguchi, J. M. Fink, and P. Rabl
Phys. Rev. A 105, 062454 – Published 29 June 2022

Abstract

We investigate the deterministic generation and distribution of entanglement in large quantum networks by driving distant qubits with the output fields of a nondegenerate parametric amplifier. In this setting, the amplifier produces a continuous Gaussian two-mode squeezed state, which acts as a quantum-correlated reservoir for the qubits and relaxes them into a highly entangled steady state. Here we are interested in the maximal amount of entanglement and the optimal entanglement generation rates that can be achieved with this scheme under realistic conditions taking, in particular, the finite amplifier bandwidth, waveguide losses, and propagation delays into account. By combining exact numerical simulations of the full network with approximate analytic results, we predict the optimal working point for the amplifier and the corresponding qubit-qubit entanglement under various conditions. Our findings show that this passive conversion of Gaussian into discrete-variable entanglement offers a robust and experimentally very attractive approach for operating large optical, microwave, or hybrid quantum networks, for which efficient parametric amplifiers are currently developed.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 6 April 2022
  • Revised 26 May 2022
  • Accepted 10 June 2022

DOI:https://doi.org/10.1103/PhysRevA.105.062454

©2022 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

J. Agustí1, Y. Minoguchi1, J. M. Fink2, and P. Rabl1

  • 1Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria
  • 2Institute of Science and Technology Austria, am Campus 1, 3400 Klosterneuburg, Austria

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 105, Iss. 6 — June 2022

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×