Optical codeword demodulation with error rates below standard quantum limit using a conditional nulling receiver

Details Optical codeword demodulation with error rates below standard quantum limit using a conditional nulling receiver Optical codeword demodulation with error rates below standard quantum limit using a conditional nulling receiver

2011-11-17

arxiv.org/abs/1111.4017v2

Physics

Quantum Physics

6 pages, 4 figures

Scientific paper

The quantum states of two laser pulses---coherent states---are never mutually orthogonal, making perfect discrimination impossible. Even so, coherent states can achieve the ultimate quantum limit for capacity of a classical channel, the Holevo capacity. Attaining this requires the receiver to make joint-detection measurements on long codeword blocks, optical implementations of which remain unknown. We report the first experimental demonstration of a joint-detection receiver, demodulating quaternary pulse-position-modulation (PPM) codewords at a word error rate of up to 40% (2.2 dB) below that attained with direct-detection, the largest error-rate improvement over the standard quantum limit reported to date. This is accomplished with a conditional nulling receiver, which uses optimized-amplitude coherent pulse nulling, single photon detection and quantum feedforward. We further show how this translates into coding complexity improvements for practical PPM systems, such as in deep-space communication. We anticipate our experiment to motivate future work towards building Holevo-capacity-achieving joint-detection receivers.

Affiliated with

Also associated with

No associations

Rating

Optical codeword demodulation with error rates below standard quantum limit using a conditional nulling receiver does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optical codeword demodulation with error rates below standard quantum limit using a conditional nulling receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical codeword demodulation with error rates below standard quantum limit using a conditional nulling receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-349250