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Quantum states generation and manipulation in a programmable silicon-photonic four-qubit system with high-fidelity and purity
- Authors
- Jong-Moo Lee, Jiho Park, Jeongho Bang, Young-Ik Sohn, Alessio Baldazzi, Matteo Sanna, Stefano Azzini, Lorenzo Pavesi
- Issue Date
- 2024-07
- Citation
- APL PHOTONICS, v.9, no.7, pp.1-9
- ISSN
- 2378-0967
- Publisher
- AIP PUBLISHING
- Language
- English
- Type
- Journal Article
- Abstract
- We present a programmable silicon photonic four-qubit integrated circuit for the generation and manipulation of diverse quantum states. The silicon photonic chip integrates photon-pair sources, pump-reducing filters, wavelength-division-multiplexing filters, Mach–Zehnder interferometer switches, and single-qubit arbitrary gates, enabling versatile state preparation and tomography. We measure Hong–Ou–Mandel interference with an impressive 98% visibility using four-photon coincidence, laying the foundation for high-purity qubits. Our analysis involves estimating the fidelity and purity of distinct quantum states through maximum-likelihood estimation applied to tomographic measurements. In our experimental results, we showcase the following achievements: a heralded single qubit achieving 98.2% fidelity and 98.3% purity, a Bell state reaching 95.2% fidelity and 94.8% purity, and a four-qubit system with two simultaneous Bell states exhibiting 87.4% fidelity and 84.6% purity. Finally, a four-qubit Greenberger–Horne–Zeilinger (GHZ) state demonstrates 85.4% fidelity and 81.7% purity. In addition, we certify the entanglement of the four-photon GHZ state through Bell’s inequality violations and a negative entanglement witness.
- KSP Keywords
- Bell state, GHZ state, High-fidelity, High-purity, Integrated circuit(IC), Quantum states, Silicon photonics, State preparation, Wavelength Division Multiplexed(WDM), maximum likelihood estimation(MLE), photon coincidence
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
