When Noise is the Signal: Highlights in Qubit-Based Quantum Spectral Estimation

When Noise is the Signal: Highlights in Qubit-Based Quantum Spectral Estimation | Qiskit Seminar Series with Lorenza Viola


Speaker: Lorenza Viola
Host: Zlatko Minev, PhD.

Abstract:

Accurate characterization and control of open quantum systems exposed to realistic, non-Markovian noise are vital for exploiting the full potential of quantum technologies and eventually reaching quantum fault tolerance. Thanks to their exquisite sensitivity to the surrounding environment, qubits can be naturally considered as “spectrometers,” or sensors, of their own noise. I will first explain how formalizing this intuition has led, over the past decade, to the development of quantum control techniques - collectively referred to as “quantum noise spectroscopy” - for determining the noise spectral properties in a variety of qubit platforms. I will then highlight some of our contributions, by describing how protocols inspired by “spin-locking relaxometry” may be used to characterize noise that is both spatiotemporally correlated and non-classical in single- and two-qubit systems, and how these protocols can be made robust against state preparation and measurement errors. Finally, I will discuss limitations of standard noise spectroscopy methods, and point to a recently introduced approach which leverages the notion of a “frame” to incorporate finite control resources from the outset - thereby allowing for a more efficient, “model-reduced” solution to the characterization and control problem of interest.

Bio:

Lorenza Viola is a theoretical physicist specializing in quantum information science. Following a “Laurea” (MS) degree in physics from the University of Trento, Italy, in 1991, and a Ph.D. in theoretical physics from the University of Padua, Italy, in 1996, she has been a postdoctoral fellow at the Massachusetts Institute of Technology until 2000 and then a J. R. Oppenheimer Fellow at Los Alamos National Laboratory. In 2004, she joined the Department of Physics and Astronomy at Dartmouth College, where she is now the James Frank Family Professor of Physics. Her research interests cover a range of topics within quantum information physics and quantum statistical mechanics — including methods for noise characterization and control in open quantum systems and quantum computation, quantum sensing and metrology, quantum phase transitions and topological phases of matter. She is a board member of the International Physics and Control Society and is presently serving as a Divisional Associate Editor for Physical Review Letters. For her contributions, she has been elected a Fellow of the American Physical Society in 2014.

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The Qiskit Seminar Series is a deep dive into various academic and research topics within the quantum community. It will feature community members and leaders every Friday, 12 PM EDT.

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