Quantum Double Lock-in Amplifier
- URL: http://arxiv.org/abs/2303.07559v3
- Date: Fri, 8 Sep 2023 02:42:01 GMT
- Title: Quantum Double Lock-in Amplifier
- Authors: Sijie Chen, Min Zhuang, Ruihuang Fang, Yun Chen, Chengyin Han, Bo Lu,
Jiahao Huang, and Chaohong Lee
- Abstract summary: We give a general protocol for achieving a quantum double lock-in amplifier.
In analog to a classical double lock-in amplifier, our protocol is accomplished via two quantum mixers.
Our numerical calculations show that the quantum double lock-in amplifier is robust against experimental imperfections.
- Score: 4.741766179759569
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Quantum lock-in amplifier aims to extract an alternating signal within strong
noise background by using quantum strategy. However, as the target signal
usually has an unknown initial phase, we can't obtain the complete information
of its amplitude, frequency and phase in a single lock-in measurement. Here, to
overcome this challenge, we give a general protocol for achieving a quantum
double lock-in amplifier and illustrate its realization. In analog to a
classical double lock-in amplifier, our protocol is accomplished via two
quantum mixers under orthogonal pulse sequences. The two orthogonal pulse
sequences act the roles of two orthogonal reference signals in a classical
double lock-in amplifier. Combining the output signals, the complete
characteristics of the target signal can be obtained. As an example, we
illustrate the realization of our quantum double lock-in amplifier via a
five-level double-$\Lambda$ coherent population trapping system with $^{87}$Rb
atoms, in which each $\Lambda$ structure acts as a quantum mixer and the two
applied dynamical decoupling sequences take the roles of two orthogonal
reference signals. Our numerical calculations show that the quantum double
lock-in amplifier is robust against experimental imperfections, such as finite
pulse length and stochastic noise. Our study opens an avenue for extracting
complete characteristics of an alternating signal within strong noise
background, which is beneficial for developing practical quantum sensing
technologies.
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