Quantum state engineering, purification, and number-resolved photon detection with high-finesse optical cavities

Journal Article · Thu Apr 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.043832· OSTI ID:21408726

Nielsen, Anne E. B. ^[1]; Muschik, Christine A; Giedke, Geza; Vollbrecht, K G. H. ^[2]

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1. Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)
2. Max-Planck-Institut fuer Quantenoptik, Hans-Kopfermann-Strasse, D-85748 Garching (Germany)

We propose and analyze a multifunctional setup consisting of high-finesse optical cavities, beam splitters, and phase shifters. The basic scheme projects arbitrary photonic two-mode input states onto the subspace spanned by the product of Fock states |n>|n> with n=0,1,2,.... This protocol does not only provide the possibility to conditionally generate highly entangled photon number states as resource for quantum information protocols but also allows one to test and hence purify this type of quantum states in a communication scenario, which is of great practical importance. The scheme is especially attractive as a generalization to many modes allows for distribution and purification of entanglement in networks. In an alternative working mode, the setup allows for quantum nondemolition number resolved photodetection in the optical domain.

• OSTI ID: 21408726
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAMS
BOSONS
COMMUNICATIONS
DETECTION
DISTRIBUTION
ELEMENTARY PARTICLES
ENGINEERING
INFORMATION
MASSLESS PARTICLES
PHASE SHIFT
PHOTONS
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION