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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

All-optical flip-flop memory for quantum computing

Eric Donkor

Published May 13, 2011• 2 citations
Publisher

Abstract

We present an experimental demonstration of an all-optical flip-flop based on mode competition in a polarization-coupled two-energy system. The two energy systems are comprised of a semiconductor optical amplifier and a supercontinuum generator. Adjusting the polarization state of the coupling between the two energy systems allows for a stable cycling between the four states of a flip-flop namely: (off, off); (off, on); (on, off); (on, on). So that, in this case, representing qubit by orthogonal polarization states enables qubit storage and logic operations.

DOI
10.1117/12.884508

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We present an experimental demonstration of an all-optical flip-flop based on mode competition in a polarization-coupled two-energy system. The two energy systems are comprised of a semiconductor optical amplifier and a supercontinuum generator. Adjusting the polarization state of the coupling between the two energy systems allows for a stable cycling between the four states of a flip-flop namely: (off, off); (off, on); (on, off); (on, on). So that, in this case, representing qubit by orthogonal polarization states enables qubit storage and logic operations.
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An all-optical flip-flop, the memory of which is based on dispersive bistability in a single vertical cavity semiconductor optical amplifier, is demonstrated experimentally. Flip-flop control is achieved using two mechanisms: cross-phase modulation to set the flip-flop and cross-gain modulation of the holding beam within a remote SOA to reset it. Optical control signals are sub-milliwatt in power and derived from a single 5 ns, 1539 nm initial pulse. Flip-flop operation at 1542 nm is polarisation insensitive to control signals and achieved with an on-off contrast greater than 3 dB.
Passive fiber ring resonators synchronously pumped by cw trains of ultrashort pulses are shown to exhibit polarization symmetry breaking. Application of this feature to all-optical storage is considered. The proposed storage device operates in the flip-flop mode which makes possible all-optical writing and erasing operations on individual bits. Numerical simulations suggest that a storage capacity of the order of thousand bits could be attainable at bit rates of hundreds of Gb/s with a maximum information processing rate of several Gb/s