Superadditive Communication with the Green Machine: A Practical Demonstration of Nonlocality without Entanglement
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909588590166016 |
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| author | Cui, Chaohan Postlewaite, Jack Saif, Babak N. Fan, Linran Guha, Saikat |
| author_facet | Cui, Chaohan Postlewaite, Jack Saif, Babak N. Fan, Linran Guha, Saikat |
| contents | Achieving the ultimate Holevo limit of optical communication capacity requires a joint-detection receiver which makes a collective quantum measurement over multiple modulated symbols. Such superadditivity -- a higher communication rate than that achievable by symbol-by-symbol optical detection -- is a special case of the well-known nonlocality without entanglement and has yet to be demonstrated. In this article, we propose and demonstrate a design of joint-detection receivers, the Green Machine, that can achieve superadditivity. We build this receiver and show that its capacity surpasses any symbol-by-symbol receivers in the photon-starved regime with binary-phase-shift-keying (BPSK). Our Green Machine receiver can also significantly reduce the transmitter peak power requirement compared with the pulse-position modulation (the conventional modulation format used for deep space laser communication). We further show that the self-referenced phase makes it immune to phase noise, e.g., atmospheric turbulence or platform vibrations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_05889 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Superadditive Communication with the Green Machine: A Practical Demonstration of Nonlocality without Entanglement Cui, Chaohan Postlewaite, Jack Saif, Babak N. Fan, Linran Guha, Saikat Quantum Physics Optics Achieving the ultimate Holevo limit of optical communication capacity requires a joint-detection receiver which makes a collective quantum measurement over multiple modulated symbols. Such superadditivity -- a higher communication rate than that achievable by symbol-by-symbol optical detection -- is a special case of the well-known nonlocality without entanglement and has yet to be demonstrated. In this article, we propose and demonstrate a design of joint-detection receivers, the Green Machine, that can achieve superadditivity. We build this receiver and show that its capacity surpasses any symbol-by-symbol receivers in the photon-starved regime with binary-phase-shift-keying (BPSK). Our Green Machine receiver can also significantly reduce the transmitter peak power requirement compared with the pulse-position modulation (the conventional modulation format used for deep space laser communication). We further show that the self-referenced phase makes it immune to phase noise, e.g., atmospheric turbulence or platform vibrations. |
| title | Superadditive Communication with the Green Machine: A Practical Demonstration of Nonlocality without Entanglement |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2310.05889 |