aiqbench takeQuantum Computing

Researchers have developed an in situ calibration protocol that simultaneously estimates beam splitter transmissivity and detector quantum efficiency, achieving a five-fold reduction in parameter uncertainty without requiring external procedures. This advancement directly addresses the trade-off between accuracy and speed in characterizing non-Gaussian optical states, which are critical for advancing quantum computation and metrology. By leveraging standard measurement data during device operation, this method streamlines the characterization of complex quantum systems essential for scaling quantum technologies.

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Researchers Measure Key Metrics for Quantum Devices

Quantum ZeitgeistSeptember 30, 20263 min read

Previously, calibrating devices for quantum technologies meant choosing between accuracy and operational speed. Now, a new technique delivers both by simultaneously estimating key device characteristics, beam splitter transmissivity around 0. 9 to 0.

The transmissivity of the beam splitter and quantum efficiency of the heralding detector are key concerns for accurate assessment of generated non-classical states. An experimentally feasible in situ scheme simultaneously estimates both parameters using solely measurement data obtained during device operation. The protocol combines click statistics from an on/off heralding detector with homodyne measurements performed on the transmitted…

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