An entangling quantum-logic gate operated with an ultrabright single photon-source
O. Gazzano, M. P. Almeida, A. K. Nowak, S. L. Portalupi, A., Lema\^itre, I. Sagnes, and A. G. White., P. Senellart

TL;DR
This paper demonstrates an entangling quantum-logic gate using an ultrabright solid-state single-photon source, achieving high fidelity and entanglement thresholds with improved source brightness.
Contribution
It introduces a photonic quantum-logic gate operated with a highly bright solid-state single-photon source, showing significant entanglement and fidelity improvements over previous methods.
Findings
Achieved a truth table overlap of 68.4% at 0.56 photons/pulse brightness.
Bell-state fidelity exceeded 50% threshold, reaching 71.0% at 0.15 photons/pulse.
Demonstrated entangling operation with high source brightness and fidelity.
Abstract
We demonstrate unambiguous entangling operation of a photonic quantum-logic gate driven by an ultrabright solid-state single-photon source. Indistinguishable single photons emitted by a single semiconductor quantum dot in a micropillar optical cavity are used as target and control qubits. For a source brightness of 0.56 collected photons-per-pulse, the measured truth table has an overlap with the ideal case of 68.4%, increasing to 73.0% for a source brightness of 0.17 photons- per-pulse. The gate is entangling: at a source brightness of 0.48, the Bell-state fidelity is above the entangling threshold of 50%, and reaches 71.0% for a source brightness of 0.15.
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