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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14 June 2013
Li, H.W.
3bb333f9-4532-4e6b-bb68-d42070f70293
Wabnig, J.
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Bitauld, D.
071c1347-ce0e-41a7-998d-48e142bca728
Shadbolt, P.
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Politi, A.
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Laing, A.
07921414-3e4a-4ed6-89e6-aeebb76062cc
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), .
(doi:10.1088/1367-2630/15/6/063017).
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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1367-2630_15_6_063017.pdf
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Published date: 14 June 2013
Organisations:
Quantum, Light & Matter Group
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Local EPrints ID: 377110
URI: http://eprints.soton.ac.uk/id/eprint/377110
PURE UUID: 62644f06-a6a3-4901-98a2-898f5516bb48
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Date deposited: 22 May 2015 10:44
Last modified: 15 Mar 2024 03:49
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Author:
H.W. Li
Author:
J. Wabnig
Author:
D. Bitauld
Author:
P. Shadbolt
Author:
A. Laing
Author:
J.L. O'Brien
Author:
A.O. Niskanen
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