Programmable entangled qubit states on a linear-optical platform

• URL: http://arxiv.org/abs/2410.15697v1
• Date: Mon, 21 Oct 2024 07:10:08 GMT
• Title: Programmable entangled qubit states on a linear-optical platform
• Authors: N. N. Skryabin, Yu. A. Biriukov, M. A. Dryazgov, S. A. Fldzhyan, S. A. Zhuravitskii, A. S. Argenchiev, I. V. Kondratyev, L. A. Tsoma, K. I. Okhlopkov, I. M. Gruzinov, K. V. Taratorin, M. Yu. Saygin, I. V. Dyakonov, M. V. Rakhlin, A. I. Galimov, G. V. Klimko, S. V. Sorokin, I. V. Sedova, M. M. Kulagina, Yu. M. Zadiranov, A. A. Toropov, S. A. Evlashin, A. A. Korneev, S. P. Kulik, S. S. Straupe,
• Abstract summary: We present an experimental platform for linear-optical quantum information processing. We demonstrate the capability in producing heralded arbitrary two-qubit dual-rail encoded states. We achieved high-fidelity quantum state preparation, with a fidelity of 98.5% specifically for the Bell state.
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• Abstract: We present an experimental platform for linear-optical quantum information processing. Our setup utilizes multiphoton generation using a high-quality single-photon source, which is demultiplexed across multiple spatial channels, a custom-designed, programmable, low-loss photonic chip, and paired with high-efficiency single-photon detectors. We demonstrate the platform's capability in producing heralded arbitrary two-qubit dual-rail encoded states, a crucial building block for large-scale photonic quantum computers. The programmable chip was fully characterized through a calibration process that allowed us to create a numerical model accounting for fabrication imperfections and measurement errors. As a result, using on-chip quantum state tomography (QST), we achieved high-fidelity quantum state preparation, with a fidelity of 98.5\% specifically for the Bell state.

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