Weak entanglement improves quantum communication using only product measurements
(2024) In Physical Review Applied 21(3).- Abstract
We show that weakly entangled states can improve communication over a qubit channel using only separate, interference-free, measurements of individual photons. We introduce a communication task corresponding to the cryptographic primitive known as secret sharing and show that all steerable two-qubit isotropic states provide a quantum advantage in the success rate using only product measurements. Furthermore, we show that such measurements can even reveal communication advantages from noisy partially entangled states that admit no quantum steering. We then go further and consider a stochastic variant of secret sharing based on more-sophisticated, yet standard, partial Bell-state analyzers, and show that this reveals advantages also for a... (More)
We show that weakly entangled states can improve communication over a qubit channel using only separate, interference-free, measurements of individual photons. We introduce a communication task corresponding to the cryptographic primitive known as secret sharing and show that all steerable two-qubit isotropic states provide a quantum advantage in the success rate using only product measurements. Furthermore, we show that such measurements can even reveal communication advantages from noisy partially entangled states that admit no quantum steering. We then go further and consider a stochastic variant of secret sharing based on more-sophisticated, yet standard, partial Bell-state analyzers, and show that this reveals advantages also for a range of unsteerable isotropic states. By preparing polarization qubits in unsteerable states, we experimentally demonstrate increased success rates of both secret-sharing tasks beyond the best entanglement-unassisted qubit protocol. Our results reveal the capability of simple and scalable measurements in entanglement-assisted quantum communication to overcome large amounts of noise.
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- author
- Piveteau, Amélie LU ; Abbott, Alastair A. ; Muhammad, Sadiq ; Bourennane, Mohamed and Tavakoli, Armin LU
- organization
- publishing date
- 2024-03
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Applied
- volume
- 21
- issue
- 3
- article number
- 034053
- publisher
- American Physical Society
- external identifiers
-
- scopus:85188671753
- ISSN
- 2331-7019
- DOI
- 10.1103/PhysRevApplied.21.034053
- language
- English
- LU publication?
- yes
- id
- 8f35cbab-aaa4-4de3-80da-863d04c9c025
- date added to LUP
- 2024-04-19 10:53:02
- date last changed
- 2024-04-19 10:54:02
@article{8f35cbab-aaa4-4de3-80da-863d04c9c025,
abstract = {{<p>We show that weakly entangled states can improve communication over a qubit channel using only separate, interference-free, measurements of individual photons. We introduce a communication task corresponding to the cryptographic primitive known as secret sharing and show that all steerable two-qubit isotropic states provide a quantum advantage in the success rate using only product measurements. Furthermore, we show that such measurements can even reveal communication advantages from noisy partially entangled states that admit no quantum steering. We then go further and consider a stochastic variant of secret sharing based on more-sophisticated, yet standard, partial Bell-state analyzers, and show that this reveals advantages also for a range of unsteerable isotropic states. By preparing polarization qubits in unsteerable states, we experimentally demonstrate increased success rates of both secret-sharing tasks beyond the best entanglement-unassisted qubit protocol. Our results reveal the capability of simple and scalable measurements in entanglement-assisted quantum communication to overcome large amounts of noise.</p>}},
author = {{Piveteau, Amélie and Abbott, Alastair A. and Muhammad, Sadiq and Bourennane, Mohamed and Tavakoli, Armin}},
issn = {{2331-7019}},
language = {{eng}},
number = {{3}},
publisher = {{American Physical Society}},
series = {{Physical Review Applied}},
title = {{Weak entanglement improves quantum communication using only product measurements}},
url = {{http://dx.doi.org/10.1103/PhysRevApplied.21.034053}},
doi = {{10.1103/PhysRevApplied.21.034053}},
volume = {{21}},
year = {{2024}},
}