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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, Quantum states, Silicon photonics, State preparation, Wavelength-Division multiplexing(WDM), integrated circuit(IC), maximum likelihood estimation(MLE), photon coincidence
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
