Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Z02: Experimental Advances and Open Quantum Systems in the Thermodynamic Regime
11:30 AM–2:18 PM,
Friday, March 10, 2023
Room: Room 125
Sponsoring
Units:
GSNP DQI
Chair: Gabriel Landi, University of Rochester
Abstract: Z02.00003 : Implementation of a coherent feedback clock using superconducting resonators*
11:54 AM–12:06 PM
Author not Attending
Presenter:
Stefan Zeppetzauer
(University of Queensland)
Authors:
Stefan Zeppetzauer
(University of Queensland)
Leonardo A Morais
(University of Queensland)
Xin HE
(University of Queensland)
Gerard J Milburn
(Univ of Queensland)
Arkady Fedorov
(University of Queensland)
Here, we present the realisation of a new type of periodic quantum clock, based on coherent feedback in a system of coupled resonators. The absence of measurement-induced noise allows investigating the inherent quantum noise of the system and its effects on the clock properties.
We implement the coherent feedback clock on a superconducting circuit consisting of two coupled high-Q coplanar resonators, where one is rendered nonlinear by a Josephson junction embedded in the centre conductor. This provides the nonlinearity necessary for a periodic clock. We show the existence of limit cycles in the quantum regime, where quantum fluctuations become the dominant source of noise, and demonstrate the applicability of the system as a new type of quantum clock. Specifically, we show the relation between dissipated energy and clock resolution, and how quantum fluctuations in the feedback cycle affect the clock tick accuracy.
In addition, our clock is a natural candidate for the implementation of spiking neural networks, a novel deep learning model that mimics the behaviour of biological neurons and shows promising advantages in dynamic learning tasks compared to conventional perceptron models.
*The authors acknowledge support from the University of Queensland, the Australian Research Council Centre of Excellence for Engineered Quantum Systems and the Foundational Questions Institute.
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