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 |
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Journal | Physical Review Letters |
Volume | 101 |
Issue number | 25 |
Pages (from-to) | 250501 |
ISSN | 0031-9007 |
DOIs | |
Publication status | Published - 2008 |
Bibliographical note
Copyright 2008 American Physical SocietyKeywords
- CONTINUOUS VARIABLE SYSTEMS
- CRITERION
- ERROR-CORRECTION
- OSCILLATOR