Toward vibration measurement via frequency-entangled two-photon interferometry

Spencer J. Johnson; Colin P. Lualdi; Andrew P. Conrad; Nathan T. Arnold; Michael Vayninger; Paul G. Kwiat

doi:10.1117/12.2650820

8 March 2023 Toward vibration measurement via frequency-entangled two-photon interferometry

Spencer J. Johnson, Colin P. Lualdi, Andrew P. Conrad, Nathan T. Arnold, Michael Vayninger, Paul G. Kwiat

Proceedings Volume 12447, Quantum Sensing, Imaging, and Precision Metrology; 124471C (2023) https://doi.org/10.1117/12.2650820
Event: SPIE Quantum West, 2023, San Francisco, California, United States

Abstract

We present progress toward measuring nanometer-scale vibrations via a frequency-entangled two-photon interferometer. Unlike classical interference, two-photon – or Hong-Ou-Mandel – interference allows for optical metrology with resilience against imbalanced loss, dispersion, and optical background. However, the resolution of traditional degenerate frequency two-photon interference is limited by the photons’ bandwidths, requiring large bandwidths or long integration times to achieve nanometer-scale resolution. We have implemented a twophoton interferometer utilizing highly non-degenerate frequency-entangled photon pairs at 810 nm and 1550 nm, drastically increasing measurement sensitivity while retaining the advantages of two-photon interference. This enhancement comes via a beat note with frequency proportional to the photon detuning of 177 THz. The resulting measurement saturates the quantum Cram´er-Rao bound, maximizing the information extracted per photon. We have demonstrated a measurement resolution of 2.3 nm with fewer than 18,000 detected photon pairs, orders of magnitude better than previous results. By reflecting one photon from the pair off a target surface, we may use our system to study small-scale vibrations.

Conference Presentation

Citation Download Citation

Spencer J. Johnson, Colin P. Lualdi, Andrew P. Conrad, Nathan T. Arnold, Michael Vayninger, and Paul G. Kwiat "Toward vibration measurement via frequency-entangled two-photon interferometry", Proc. SPIE 12447, Quantum Sensing, Imaging, and Precision Metrology, 124471C (8 March 2023); https://doi.org/10.1117/12.2650820

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