Quantum Electrical and Computer Engineering

Theories and protocols in Electrical and Computer Engineering (ECE) have been developed largely based on intuitions from classical physics. As quantum devices and signals play increasingly important roles, QIS will be indispensable to the emerging field of Quantum ECE. We are interested in investigating possible quantum advantages brought by QIS in a variety of topics including sensing/metrology/decision-making, mixed analog-digital quantum signal processing, and computer architecture.

 

Quantum Sensing and Metrology

We generalized quantum signal processing from spin dynamics to continuous-variable systems, and use it to design algorithmic quantum sensing protocols at the fundamental limit of quantum mechanics, which can ``steer” the quantum sensor’s state tailored to the underlying signal of interest.

Our quantum signal processing interferometry protocol as a novel algorithmic framework for quantum sensing, in particular quantum decision, at the fundamental limits of quantum mechanics.

 

Mixed Analog-Digital Quantum Signal Processing

The hallmark of digital signal processing is Fourier transform and filter design. Envisioning a quantum future with an increasing demand of processing quantum signals and data, we seek to harness the power of quantum systems and computers for signal processing in the mixed digital-analog fashion.

Schematic of signal types and AD/DA conversions in mixed analog-digital signal processing. Their quantum counterparts need to be developed to unleash the power of quantum in signal processing.

References

2025

  1. fir.png
    Implementing Finite Impulse Response Filters on Quantum Computers
    Aishwarya Majumdar, Bojko N. Bakalov, Dror Baron, and Yuan Liu\(^\dagger\)
    In 2025 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2025
    PDF

2024

  1. CV-DV_schematic.png
    Toward Mixed Analog-Digital Quantum Signal Processing: Quantum AD/DA Conversion and the Fourier Transform
    Yuan Liu*\(^\dagger\), John M. Martyn*, Jasmine Sinanan-Singh, Kevin C. Smith, Steven M. Girvin, and Isaac L. Chuang
    2024
    arXiv PDF
  2. fig2_window.png
    Single-shot Quantum Signal Processing Interferometry
    Jasmine Sinanan-Singh, Gabriel L Mintzer, Isaac L Chuang, and Yuan Liu\(^\dagger\)
    Quantum, 2024
    HTML PDF
  3. ARQUINFig1.pdf
    ARQUIN : Architectures for Multinode Superconducting Quantum Computers
    James Ang, Gabriella Carini, Yanzhu Chen, Isaac Chuang, Michael DeMarco, Sophia Economou, Alec Eickbusch, Andrei Faraon, Kai-Mei Fu, Steven Girvin, Michael Hatridge, Andrew Houck, Paul Hilaire, Kevin Krsulich, Ang Li, Chenxu Liu, Yuan Liu, Margaret Martonosi, David McKay, Jim Misewich, Mark Ritter, Robert Schoelkopf, Samuel Stein, Sara Sussman, Hong Tang, Wei Tang, teague tomesh, Norm Tubman, Chen Wang, Nathan Wiebe, Yongxin Yao, Dillon Yost, and Yiyu Zhou
    ACM Transactions on Quantum Computing, 2024
    HTML PDF