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Calibration and high fidelity measurement of a quantum photonic chip

Calibration and high fidelity measurement of a quantum photonic chip
Calibration and high fidelity measurement of a quantum photonic chip
Integrated quantum photonic circuits are becoming increasingly complex. Accurate calibration of device parameters and detailed characterization of the prepared quantum states are critically important for future progress. Here we report on an effective experimental calibration method based on Bayesian updating and Markov chain Monte Carlo integration. We use this calibration technique to characterize a two qubit chip and extract the reflectivities of its directional couplers. An average quantum state tomography fidelity of 93.79 ± 1.05% against the four Bell states is achieved. Furthermore, comparing the measured density matrices against a model using the non-ideal device parameters derived from the calibration we achieve an average fidelity of 97.57 ± 0.96%. This pinpoints non-ideality of chip parameters as a major factor in the decrease of Bell state fidelity. We also perform quantum state tomography for Bell states while continuously varying photon distinguishability and find excellent agreement with theory
63017
Li, H.W.
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Wabnig, J.
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Bitauld, D.
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Shadbolt, P.
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Politi, A.
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Laing, A.
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O'Brien, J.L.
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Niskanen, A.O.
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Li, H.W.
3bb333f9-4532-4e6b-bb68-d42070f70293
Wabnig, J.
d8569a05-4dc5-45ed-8d26-a5825fc8e704
Bitauld, D.
071c1347-ce0e-41a7-998d-48e142bca728
Shadbolt, P.
3e48bf7a-aea6-49b7-b8de-859f302c43d2
Politi, A.
cf75c0a8-d34d-4cbe-b9d5-e408c0edeeec
Laing, A.
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O'Brien, J.L.
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Niskanen, A.O.
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Li, H.W., Wabnig, J., Bitauld, D., Shadbolt, P., Politi, A., Laing, A., O'Brien, J.L. and Niskanen, A.O. (2013) Calibration and high fidelity measurement of a quantum photonic chip. New Journal of Physics, 15 (6), 63017. (doi:10.1088/1367-2630/15/6/063017).

Record type: Article

Abstract

Integrated quantum photonic circuits are becoming increasingly complex. Accurate calibration of device parameters and detailed characterization of the prepared quantum states are critically important for future progress. Here we report on an effective experimental calibration method based on Bayesian updating and Markov chain Monte Carlo integration. We use this calibration technique to characterize a two qubit chip and extract the reflectivities of its directional couplers. An average quantum state tomography fidelity of 93.79 ± 1.05% against the four Bell states is achieved. Furthermore, comparing the measured density matrices against a model using the non-ideal device parameters derived from the calibration we achieve an average fidelity of 97.57 ± 0.96%. This pinpoints non-ideality of chip parameters as a major factor in the decrease of Bell state fidelity. We also perform quantum state tomography for Bell states while continuously varying photon distinguishability and find excellent agreement with theory

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Published date: 14 June 2013
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 377110
URI: http://eprints.soton.ac.uk/id/eprint/377110
PURE UUID: 62644f06-a6a3-4901-98a2-898f5516bb48
ORCID for A. Politi: ORCID iD orcid.org/0000-0002-3668-9474

Catalogue record

Date deposited: 22 May 2015 10:44
Last modified: 20 Jul 2019 00:37

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Contributors

Author: H.W. Li
Author: J. Wabnig
Author: D. Bitauld
Author: P. Shadbolt
Author: A. Politi ORCID iD
Author: A. Laing
Author: J.L. O'Brien
Author: A.O. Niskanen

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