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Near-video frame rate quantum sensing using Hong-Ou-Mandel interferometry

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posted on 2023-06-01, 09:52 authored by SANDEEP SINGH, VIMLESH KUMAR, varun sharma, Daniele Faccio, Goutam K. Samanta
Hong-Ou-Mandel (HOM) interference, bunching of two indistinguishable photons on a balanced beam-splitter, has emerged as a promising tool for quantum sensing. There is a need for wide spectral-bandwidth photon pairs (for high-resolution sensing) with high brightness (for fast sensing). Here we show the generation of photon-pairs with flexible spectral bandwidth even using single-frequency, continuous-wave diode laser enabling high-precision, real-time sensing. Using 1-mm-long periodically-poled KTP crystal, we produced degenerate photon-pairs with a spectral bandwidth of 163.42±1.68 nm resulting in a HOM-dip width of 4.01±0.04 μm to measure a displacement of 60 nm, and sufficiently high brightness to enable the measurement of vibrations with an amplitude of 205 ± 0.75 nm and frequency of 8 Hz. Fisher-information and maximum likelihood estimation enables optical delay measurements as small as 4.97 nm with precision (Cramér-Rao bound) and accuracy of 0.89 and 0.54 nm, respectively, therefore showing HOM sensing capability for real-time, precision-augmented, in-field quantum sensing applications


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Researchers from India and the United Kingdom report on the use of Hong-Ou-Mandel interference, a quantum phenomenon in which two indistinguishable photons impinging on different input ports of a balanced 50:50 beamsplitter bunch together into one of the output ports, to detect static displacements and low-frequency vibrations with amplitudes as low as 60 nm and 200 nm, respectively. The use of bright, continuous-wave pumped spontaneous parametric down-conversion as photon source makes the authors’ experimental proposal potentially suitable for photonic integration, thus paving the way toward the development of compact, quantum-enabled sensors for the measurement of low amplitude and frequency seismic S- and P-waves. --Roberto de J. León-Montiel, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México