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Optimizing the Generation of Large Cluster States With Residual Visibility Measurements

Leonid Vidro, Valentin Guichard, Dario Fioretto, Nadia Belabas, P. Senellart, H. S. Eisenberg

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We create 6-photon linear cluster states using a resource-efficient quantum dot single photon source and linear optics setup. Shorter, high-rate, states created in the process give indications on the quality of alignment and interference for optimization.
DOI
10.1364/cleo_si.2024.sth1f.7

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Abstract Quantum states of light with many entangled photons are key resources for photonic quantum computing and quantum communication. In this work, we exploit a highly resource-efficient generation scheme based on a linear optical circuit embedding a fibered delay loop acting as a quantum memory. The single photons are generated with a bright single-photon source based on a semiconductor quantum dot, allowing to perform the entangling scheme up to 6 photons. We demonstrate 2, 3, 4 and 6-photon entanglement generation at respective rates of 6 kHz, 120 Hz, 2.2 Hz, and 2 mHz, corresponding to an average scaling ratio of 46. We introduce a method for real-time control of entanglement generation based on partially post-selected measurements. The visibility of such measurements enables discrimination and correcting for experimental phase drifts or entangling gate fidelity variations, and thus carries faithful information to monitor the entanglement process, an important feature for the practical implementation of photonic measurement-based quantum computation.