Demonstration of a Quantum Nondemolition  Sum Gate

J. Yoshikawa; Y. Miwa; Alexander Huck; Ulrik Lund Andersen; P. van Loock; A. Furusawa

doi:10.1103/PhysRevLett.101.250501

Demonstration of a Quantum Nondemolition Sum Gate

J. Yoshikawa, Y. Miwa, Alexander Huck, Ulrik Lund Andersen, P. van Loock, A. Furusawa

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Abstract

The sum gate is the canonical two-mode gate for universal quantum computation based on continuous quantum variables. It represents the natural analogue to a qubit C-NOT gate. In addition, the continuous-variable gate describes a quantum nondemolition (QND) interaction between the quadrature components of two light modes. We experimentally demonstrate a QND sum gate, employing the scheme by R. Filip, P. Marek, and U. L. Andersen [Phys. Rev. A 71, 042308 (2005)], solely based on off-line squeezed states, homodyne measurements, and feedforward. The results are verified by simultaneously satisfying the criteria for QND measurements in both conjugate quadratures.

Original language	English
Journal	Physical Review Letters
Volume	101
Issue number	25
Pages (from-to)	250501
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.101.250501
Publication status	Published - 2008

Bibliographical note

Keywords

CONTINUOUS VARIABLE SYSTEMS
CRITERION
ERROR-CORRECTION
OSCILLATOR

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10.1103/PhysRevLett.101.250501

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http://link.aps.org/doi/10.1103/PhysRevLett.101.250501

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abstract = "The sum gate is the canonical two-mode gate for universal quantum computation based on continuous quantum variables. It represents the natural analogue to a qubit C-NOT gate. In addition, the continuous-variable gate describes a quantum nondemolition (QND) interaction between the quadrature components of two light modes. We experimentally demonstrate a QND sum gate, employing the scheme by R. Filip, P. Marek, and U. L. Andersen [Phys. Rev. A 71, 042308 (2005)], solely based on off-line squeezed states, homodyne measurements, and feedforward. The results are verified by simultaneously satisfying the criteria for QND measurements in both conjugate quadratures.",

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AU - Andersen, Ulrik Lund

AU - van Loock, P.

AU - Furusawa, A.

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