Superadditive Communications with the Green Machine: A Practical
Demonstration of Nonlocality without Entanglement
- URL: http://arxiv.org/abs/2310.05889v2
- Date: Wed, 8 Nov 2023 17:43:03 GMT
- Title: Superadditive Communications with the Green Machine: A Practical
Demonstration of Nonlocality without Entanglement
- Authors: Chaohan Cui, Jack Postlewaite, Babak N. Saif, Linran Fan, Saikat Guha
- Abstract summary: Superadditivity -- a higher communication rate than that achievable by any physically realizable symbol-by-symbol optical detection -- is a special case of the celebrated nonlocality without entanglement.
We build this receiver and show that its capacity surpasses that of all practical symbol-by-symbol receivers in the low-received-photon-flux regime.
- Score: 0.6849746341453253
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: Achieving the ultimate Holevo limit of optical communications capacity
requires a joint-detection receiver: a device that makes a collective quantum
measurement over multiple modulated symbols. Such superadditivity -- a higher
communication rate than that achievable by any physically realizable
symbol-by-symbol optical detection -- is a special case of the celebrated
nonlocality without entanglement and has yet to be demonstrated in practice. In
this article, we propose a practical design of the Green Machine -- a
joint-detection receiver that can attain superadditive capacity with a
binary-phase-shift-keying (BPSK) modulated Hadamard code. We build this
receiver and show that its capacity surpasses that of all practical
symbol-by-symbol receivers in the low-received-photon-flux regime after backing
out losses within our receiver. Our Green Machine receiver not only reduces the
transmitter peak power requirement compared with the pulse-position modulation
(the conventional modulation format used for deep space laser communications),
but we show that its self-referenced phase also makes it more immune to phase
noise, e.g., atmospheric turbulence or platform vibrations, by orders of
magnitude compared with other BPSK-compatible receivers.
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