IQIM Postdoctoral and Graduate Student Seminar

Friday, January 12, 2024

3:00pm to 4:00pm

East Bridge 114

Quantum-inspired incoherent imaging and optomechanical sensing

Mankei Tsang, Quantum Measurement Group, National University of Singapore,

Abstract: By computing quantum bounds for incoherent imaging, we discovered in 2015 that the fundamental resolution of optical telescopes is much higher than previously realized [1]. The discovery has inspired the invention of a quantum-limited measurement method called spatial-mode demultiplexing (SPADE), as well as 40+ experiments over the past few years [2]. Similar calculations show that, for optical phase noise spectroscopy, spectral photon counting can be far superior to homodyne detection and achieve the fundamental quantum limit [3], an idea that has recently been picked up by the GQuEST project [4]. I also discuss an old idea of backaction noise cancellation for optomechanics [5], noting its difference from the frequency-dependent squeezing method recently demonstrated in LIGO.

[1] Tsang, Nair, and Lu, PRX 6, 031033 (2016).[2] Review paper: https://arxiv.org/abs/1906.02064; list of papers in the field: https://blog.nus.edu.sg/mankei/superresolution/[3] Ng et al., PRA 93, 042121 (2016); Tsang, PRA 107, 012611 (2023).[4] McCuller, https://arxiv.org/abs/2211.04016.[5] Tsang and Caves, PRL 105, 123601 (2010); PRX 2, 031016 (2012).

For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at marcia.brown@caltech.edu.

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IQIM Postdoctoral and Graduate Student Seminar Series

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