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SPIE Quantum Information Science, Sensing, and Computation

Integrated photonics for classical and quantum sensing

P Juodawlkis, Brian F. Aull, Connor Belanger, Colin Bruzewicz, Patrick T. Callahan, Isaac L. Chuang, Joseph S. Ciampi, Ethan Clements, Sabrina Corsetti, Kyle DeBry, Sagar P. Doshi, Bradley J. Felton, Dodd Joseph Gray, Christopher Heidelberger, Dave Kharas, May E. Kim, Felix Knollmann, John Liddell, William Loh, Thomas Mahony, Ryan Maxson, Alexander Medeiros, Michael E. Mitchell, Rachel Morgan, David Reens, Matthew Roychowdhury, Kevin Kyungbum Ryu, Jason J. Plant, Meghan Schuldt, William Setzer, Lucy Shamel, Alkesh Sumant, Reuel B. Swint, Gavin N. West, Danielle Braje, Robert McConnell, John Chiaverini, Siva S. Yegnanarayanan, Cheryl M. Sorace-Agaskar

Published May 30, 2025• 0 citations
Publisher
DOI
10.1117/12.3069210

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Distributed quantum sensing is an emerging application of quantum networking, where entangled probe states are employed to sense combinations of delocalized parameters with enhanced precision relative to using separable states. Squeezed states of light are a prime resource for experimental demonstrations of entanglement-enhanced sensing, because they can be generated and entangled deterministically. Existing distributed quantum sensing experiments have been fundamentally limited in scalability due to their bulk-optic architectures. Meanwhile, integrated photonics provides a scalable and compact platform for quantum sensors. Here we demonstrate entanglement-enhanced sensing of linear functions of four phase shifts in an integrated photonic circuit. We find an entanglement-enhanced precision of 0.199(16) dB below the shot noise limit compared to 0.041(18) dB for separable states. A four-mode entangled state is generated on-chip with entanglement verification and phase sensing also performed on-chip with an array of four integrated homodyne detectors.