Complete and fidelity-robust hyperentangled-state analysis of photon systems with single-sided quantum-dot-cavity systems under the balance condition - INSPIRE

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Complete and fidelity-robust hyperentangled-state analysis of photon systems with single-sided quantum-dot-cavity systems under the balance condition

Sep 13, 2023

Published in:

Quant.Inf.Proc. 22 (2023) 9, 344

Published: Sep 13, 2023

DOI:

10.1007/s11128-023-04101-2

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Abstract: (Springer)

Hyperentangled Bell-state analysis (HBSA) for two-photon systems and hyperentangled Greenberger–Horne–Zeilinger-state analysis (HGSA) for multi-photon systems play significant roles in quantum information processing. In this paper, we propose a complete and fidelity-robust spatial-polarization two-photon HBSA scheme and generalize it to unambiguous multi-photon HGSA based on the interaction between single photons and singly charged quantum dots (QDs) in optical microcavities under the balance condition. Under the balance condition, the requirement for side-leakage rate and coupling strength for the QD-cavity system can be relaxed and the noise brought on by the unbalanced reflectance of coupled and uncoupled QD-cavity systems is effectively suppressed, raising the fidelity of our schemes to unity in theory. When generalizing to the multi-photon HGSA, our scheme can effectively suppress the decrease in efficiency resulting from the increase in the number of photons. In addition, our schemes simplify the discrimination process and reduce the required light–matter interaction by using self-assisted mechanism. These advantages make our schemes more universal and feasible for high-capacity quantum communications and quantum networks based on hyperentanglement with currently available techniques.

Hyperentangled-state analysis
Photon system
QD-cavity system
Balance condition
Self-assisted mechanism

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