Engineering discontinuous quantum phase transitions for weak signal detection (Conference Presentation)

Li-Ping Yang; Zubin Jacob

doi:10.1117/12.2528285

10 September 2019 Engineering discontinuous quantum phase transitions for weak signal detection (Conference Presentation)

Li-Ping Yang, Zubin Jacob

Author Affiliations +

Proceedings Volume 11091, Quantum Nanophotonic Materials, Devices, and Systems 2019; 110910Q (2019) https://doi.org/10.1117/12.2528285
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

We introduce a first-order quantum-phase-transition model, which exhibits giant sensitivity χ∝N2 at the critical point. Exploiting this effect, we propose a quantum critical detector (QCD) to amplify weak input signals. The time-dynamic QCD functions by triggering a first-order dynamical quantum phase transition in a system of spins with long-range interactions coupled to a bosonic mode. We numerically demonstrate features of the dynamical quantum phase transition, which leads to a time-dependent quantum gain. We also show the linear scaling with the spin number N in both the quantum gain and the corresponding signal-to-quantum noise ratio of this QCD. Our QCD can be a resource for metrology, weak signal amplification, and single photon detection.

Conference Presentation

Citation Download Citation

Li-Ping Yang and Zubin Jacob "Engineering discontinuous quantum phase transitions for weak signal detection (Conference Presentation)", Proc. SPIE 11091, Quantum Nanophotonic Materials, Devices, and Systems 2019, 110910Q (10 September 2019); https://doi.org/10.1117/12.2528285

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