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Moscow University Physics Bulletin

Utilization of phase squeezed light for information transfer

M. A. Gurkovskaya

Published Feb 1, 2010• 2 citations
Publisher

Abstract

A technique for information transfer using phase squeezed states of light is considered. The optimal squeezing that minimizes the quantum decoding error is calculated. The minimum phase uncertainty is determined.
DOI
10.3103/s0027134910010042

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In order to improve the error probability of generating entanglement by communication for quantum computation, we propose the use of squeezed light. When generating entanglement between two atoms by communication, the error probability can be reduced by increasing the distance between quantum states of probe light in phase space. The phase rotation of light depends on the atom-photon coupling strength and the light amplitude, which are limited in practice. A large error probability has been expected for coherent probe light. If we assume typical values of light amplitude and phase rotation, $\ensuremath{\alpha}=100$ and $\ensuremath{\theta}=0.01$, the error probability is estimated to be Pcoh(min)=0.14{P}_{\mathrm{coh}}^{(\mathrm{min})}=0.14Pcoh(min)​=0.14 and Pcoh(hom)=0.23{P}_{\mathrm{coh}}^{(\mathrm{hom})}=0.23Pcoh(hom)​=0.23 for minimum error discrimination and homodyne measurements. The error probability can be reduced to ${P}_{\mathrm{squ}}^{(\mathrm{min})}=1.73\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ and ${P}_{\mathrm{squ}}^{(\mathrm{hom})}=4.09\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ using squeezed coherent light, where the same values of the mean photon number and the phase rotation angle are assumed for the coherent light probe. These values satisfy the requirements for scalable quantum computation.