aiqbench analysis
This paper stress-tests a previously proposed entanglement distillation protocol, which turns multiple noisy copies of an unknown two-qubit state into a single Bell pair, by modeling gate errors, readout errors, and asymmetric noise between the two parties. The protocol still improves fidelity over substantial error ranges, but how much it helps depends heavily on the error type, so hardware-specific noise characterization will determine its practical value. For readers tracking quantum networking, the asymmetric-error postselection result is the most actionable part, since it suggests ways to raise success probability without changing the hardware.
Bell-pair distillation under imperfect operations
arXiv:2610.35699v1 Announce Type: new Abstract: We recently proposed an entanglement distillation protocol based on local operations and classical communication that probabilistically and universally distills a maximally entangled Bell pair from multiple copies of an unknown two-qubit state [Phys. Rev. Lett. 135, 260202 (2025)]. Here, we investigate the robustness of this protocol against imperfections in its implementation. We consider several incoherent and coherent gate-error models, as well as measurement readout errors, and determine the regimes in which distillation enhances the fidelity with the target Bell state. We find that the protocol remains effective over substantial error ranges, although its robustness depends strongly on the type of error. We further analyze asymmetric errors between the two parties and identify conditions under which complementary postselection outcomes yield identical distillation dynamics, allowing the success probability to be enhanced.
Abstract:We recently proposed an entanglement distillation protocol based on local operations and classical communication that probabilistically and universally distills a maximally entangled Bell pair from multiple copies of an unknown two-qubit state [Phys. Rev. Lett. 135, 260202 (2025)]. Here, we investigate the robustness of this protocol against imperfections in its implementation. We consider several incoherent and coherent gate-error models, as well as measurement readout errors, and determine the regimes in which distillation enhances the fidelity with the target Bell state. We find that the protocol remains effective over substantial error ranges, although its robustness depends strongly on the type of error. We further analyze asymmetric errors between the two parties and identify conditions under which complementary postselection outcomes yield identical distillation dynamics, allowing the success probability to be enhanced.
arXiv:2610.35699 [quant-ph]
(or arXiv:2610.35699v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2610.35699 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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Full text under the publisher's open licence · 220 words
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