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Quantum storage of a photonic polarization qubit in a solid

Quantum storage of a photonic polarization qubit in a solid
Quantum storage of a photonic polarization qubit in a solid

We report on the quantum storage and retrieval of photonic polarization quantum bits onto and out of a solid state storage device. The qubits are implemented with weak coherent states at the single photon level, and are stored for a predetermined time of 500 ns in a praseodymium doped crystal with a storage and retrieval efficiency of 10%, using the atomic frequency comb scheme. We characterize the storage by using quantum state tomography, and find that the average conditional fidelity of the retrieved qubits exceeds 95% for a mean photon number μ=0.4. This is significantly higher than a classical benchmark, taking into account the Poissonian statistics and finite memory efficiency, which proves that our crystal functions as a quantum storage device for polarization qubits. These results extend the storage capabilities of solid state quantum light matter interfaces to polarization encoding, which is widely used in quantum information science.

0031-9007
Gündoǧan, Mustafa
2ec5e76b-806c-4e0a-9c79-0bf39581d2cf
Ledingham, Patrick M.
8db45fde-00d8-421a-93d6-7f18ac835c28
Almasi, Attaallah
ae971f7f-3b27-4438-85da-4cab6a7c7519
Cristiani, Matteo
5597411b-0753-4454-b435-2354f9ffeaae
De Riedmatten, Hugues
759bbde3-5fbe-4e2b-8cf5-553a58d128bd
Gündoǧan, Mustafa
2ec5e76b-806c-4e0a-9c79-0bf39581d2cf
Ledingham, Patrick M.
8db45fde-00d8-421a-93d6-7f18ac835c28
Almasi, Attaallah
ae971f7f-3b27-4438-85da-4cab6a7c7519
Cristiani, Matteo
5597411b-0753-4454-b435-2354f9ffeaae
De Riedmatten, Hugues
759bbde3-5fbe-4e2b-8cf5-553a58d128bd

Gündoǧan, Mustafa, Ledingham, Patrick M., Almasi, Attaallah, Cristiani, Matteo and De Riedmatten, Hugues (2012) Quantum storage of a photonic polarization qubit in a solid. Physical Review Letters, 108 (19), [190504]. (doi:10.1103/PhysRevLett.108.190504).

Record type: Article

Abstract

We report on the quantum storage and retrieval of photonic polarization quantum bits onto and out of a solid state storage device. The qubits are implemented with weak coherent states at the single photon level, and are stored for a predetermined time of 500 ns in a praseodymium doped crystal with a storage and retrieval efficiency of 10%, using the atomic frequency comb scheme. We characterize the storage by using quantum state tomography, and find that the average conditional fidelity of the retrieved qubits exceeds 95% for a mean photon number μ=0.4. This is significantly higher than a classical benchmark, taking into account the Poissonian statistics and finite memory efficiency, which proves that our crystal functions as a quantum storage device for polarization qubits. These results extend the storage capabilities of solid state quantum light matter interfaces to polarization encoding, which is widely used in quantum information science.

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More information

Published date: 10 May 2012

Identifiers

Local EPrints ID: 455322
URI: http://eprints.soton.ac.uk/id/eprint/455322
ISSN: 0031-9007
PURE UUID: c449043c-0202-4f5f-b378-959b4133658e
ORCID for Patrick M. Ledingham: ORCID iD orcid.org/0000-0002-9804-6132

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Date deposited: 17 Mar 2022 17:30
Last modified: 06 Jun 2024 02:08

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Contributors

Author: Mustafa Gündoǧan
Author: Attaallah Almasi
Author: Matteo Cristiani
Author: Hugues De Riedmatten

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