A Quantum Study of Multibit Phase Coding for Optical Storage
Hsu, M.T.L.
Delaubert, V.
Bowen, W.P.
Fabre, C.
Bachor, H.-A.
Ping Koy Lam
Dept. of Phys., Australian Nat. Univ., Canberra, ACT;
This paper appears in: Quantum Electronics, IEEE Journal of
Publication Date: Oct. 2006
Volume: 42,
Issue: 10
On page(s): 1001-1007
ISSN: 0018-9197
INSPEC Accession Number: 9149144
Digital Object Identifier: 10.1109/JQE.2006.881634
Current Version Published: 2006-09-25
Abstract
We propose a scheme which encodes information in both the longitudinal and spatial transverse phases of a continuous-wave optical beam. A split detector-based interferometric scheme is then introduced to optimally detect both encoded phase signals. In contrast to present day optical storage devices, our phase coding scheme has an information storage capacity which scales with the power of the read-out optical beam. We analyze the maximum number of encoding possibilities at the shot noise limit (SNL). In addition, we show that using squeezed light, the SNL can be overcome and the number of encoding possibilities increased. We discuss a possible application of our phase-coding scheme for increasing the capacities of optical storage devices
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