Generating, manipulating and measuring entanglement and mixture with a reconfigurable photonic circuit
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In a previous work, the average state fidelity of states generated by the CNOT gate, estimated by quantum process tomography, was measured to be 0.873±0.001.
“In a previous work31, we measured the average state fidelity of states generated by the CNOT gate, estimated by quantum process tomography, to be 0.873±0.001.”
From A variational eigenvalue solver on a photonic quantum processor (2014) · cites this paper as [31]
The 'Generating and characterising entanglement' section reports fidelities for four Bell states generated using the CNOT gate, measured by quantum state tomography. It does not report an average CNOT-generated state fidelity of 0.873±0.001 or say that this value was estimated by quantum process tomography; the reported Bell-state fidelities are 0.947, 0.945, 0.933 and 0.885, each ±0.002. (LLM, conf=0.84)
Experimental — accuracy not yet measuredThe unheralded (post-selected) CNOT gate is a two-photon scheme that requires detection of the two photonic qubits in a computational state to signal success with probability p = 1/9 [35-37].
“The unheralded (or post-selected) CNOT gate shown in Fig. 2(h) is a two-photon scheme that requires the detection of the two photonic qubits in a computational state to signal the success of the gate with probability p = 1 / 9 [35-37].”
From Universal linear optics (2015) · cites this paper as [35]
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References 39 · Cited by 297
- Authors
- Shadbolt, P. J., Verde, M. R., Peruzzo, A., Politi, A., Laing, A., Lobino, M., Matthews, J. C. F., Thompson, M. G., & O'Brien, J. L.
- Affiliations
- University of Bristol (GB)
- Venue
- Nature Photonics
- Published
- 2011-12-11
- Volume
- 6
- Issue
- 1
- Pages
- 45-49
- ISSN
- 1749-4885 (ISSN-L)
- 1749-4893
- OpenAlex
- W2097717468
- Cited by
- 297
- References
- 39
- Citations by year
- 2026: 6 · 2025: 10 · 2024: 17 · 2023: 16 · 2022: 14 · 2021: 16 · 2020: 16 · 2019: 20 · 2018: 19 · 2017: 11 · 2016: 32 · 2015: 35 · 2014: 32 · 2013: 32 · 2012: 21
- FWCI
- 25.05
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature Photonics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- RMIT Research Repository (RMIT University Library) (submittedVersion)
- ePrints Soton (University of Southampton) (submittedVersion)
- Figshare (submittedVersion)
- Iris (University of Trento) (submittedVersion)
- Explore Bristol Research (submittedVersion)
- Bristol Research (University of Bristol) (submittedVersion)
- Griffith Research Online (submittedVersion)
- arXiv (Cornell University)
- Funders
- Leverhulme Trust
- Intelligence Advanced Research Projects Activity
- Engineering and Physical Sciences Research Council (EP/F008023/1)
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Keywords
- quantum entanglement, mixed states, reconfigurable photonic circuits, integrated quantum photonics, entangled photon pairs, Bell inequality violation, partially entangled states, voltage-controlled phase shifter, two-qubit entangling gates, waveguide devices, quantum state generation
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