Nonunity gain minimal-disturbance measurement

Journal Article · Sat Sep 15 00:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.032309· OSTI ID:21015940

Sabuncu, Metin; Andersen, Ulrik L ^[1]; Mista, Ladislav Jr ^[2]; Fiurasek, Jaromir ^[2]; Filip, Radim ^[3]; Leuchs, Gerd ^[3]

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1. Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby (Denmark)
2. Department of Optics, Palacky University, 17. listopadu 50, 772 07 Olomouc (Czech Republic)
3. Institut fuer Optik, Information und Photonik, Max-Planck Forschungsgruppe, Universitaet Erlangen-Nuernberg, Guenther-Scharowsky strasse 1, 91058 Erlangen (Germany)

We propose and experimentally demonstrate an optimal nonunity gain Gaussian scheme for partial measurement of an unknown coherent state that causes minimal disturbance of the state. The information gain and the state disturbance are quantified by the noise added to the measurement outcomes and to the output state, respectively. We derive the optimal trade-off relation between the two noises and we show that the tradeoff is saturated by nonunity gain teleportation. Optimal partial measurement is demonstrated experimentally using a linear optics scheme with feedforward.

• OSTI ID: 21015940
• Journal Information: Physical Review. A, Vol. 76, Issue 3; Other Information: DOI: 10.1103/PhysRevA.76.032309; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAM OPTICS
DISTURBANCES
EIGENSTATES
GAUSSIAN PROCESSES
INFORMATION THEORY
NOISE
QUANTUM MECHANICS
QUANTUM TELEPORTATION