Phase Locking between Two All-Optical Quantum Memories
Abstract
Optical approaches to quantum computation require the creation of multimode photonic quantum states in a controlled fashion. Here we experimentally demonstrate phase locking of two all-optical quantum memories, based on a concatenated cavity system with phase reference beams, for the time-controlled release of two-mode entangled single-photon states. The release time for each mode can be independently determined. The generated states are characterized by two-mode optical homodyne tomography. Entanglement and nonclassicality are preserved for release-time differences up to 400 ns, confirmed by logarithmic negativities and Wigner-function negativities, respectively.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2020
- DOI:
- 10.1103/PhysRevLett.125.260508
- arXiv:
- arXiv:2009.06811
- Bibcode:
- 2020PhRvL.125z0508O
- Keywords:
-
- Quantum Physics
- E-Print:
- 15 pages, 15 figures