TY - UNPB

T1 - Fidelity estimation of quantum states on a silicon photonic chip

AU - Wollmann, Sabine

AU - Qiang, Xiaogang

AU - Pallister, Sam

AU - Montanaro, Ashley

AU - Linden, Noah

AU - Matthews, Jonathan C. F.

N1 - updated affiliation and funding

PY - 2023/6/16

Y1 - 2023/6/16

N2 - As a measure of the 'closeness' of two quantum states, fidelity plays a fundamental role in quantum information theory. Fidelity estimation protocols try to strike a balance between information gleaned from an experiment, and the efficiency of its implementation, in terms of the number of states consumed by the protocol. Here we adapt a previously reported optimal state verification protocol (Phys. Rev. Lett. 120, 170502, 2018) for fidelity estimation of two-qubit states. We demonstrate the protocol experimentally using a fully-programmable silicon photonic two-qubit chip. Our protocol outputs significantly smaller error bars of its point estimate in comparison with another widely-used estimation protocol, showing a clear step forward in the ability to estimate the fidelity of quantum states produced by a practical device.

AB - As a measure of the 'closeness' of two quantum states, fidelity plays a fundamental role in quantum information theory. Fidelity estimation protocols try to strike a balance between information gleaned from an experiment, and the efficiency of its implementation, in terms of the number of states consumed by the protocol. Here we adapt a previously reported optimal state verification protocol (Phys. Rev. Lett. 120, 170502, 2018) for fidelity estimation of two-qubit states. We demonstrate the protocol experimentally using a fully-programmable silicon photonic two-qubit chip. Our protocol outputs significantly smaller error bars of its point estimate in comparison with another widely-used estimation protocol, showing a clear step forward in the ability to estimate the fidelity of quantum states produced by a practical device.

KW - quant-ph

U2 - 10.48550/arXiv.2306.01068

DO - 10.48550/arXiv.2306.01068

M3 - Preprint

BT - Fidelity estimation of quantum states on a silicon photonic chip

ER -