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Science and Mathematics

CANCELED: Quantum information processing with superconducting circuits: Purcell effect and the measurement problem

March 12, 2020 at 3:30pm5:00pm

Physics Building, 202 / 204

This event has already occurred. The information may no longer be valid.

The Department of Physics is pleased to welcome Alexandru Petrescu for a lecture. Alexandru is a postdoctoral fellow at the Institut Quantique, Université de Sherbrooke, , working primarily with professor Alexandre Blais.  Prior to this, he was a postdoctoral research associate in professor Hakan Türeci’s quantum optics group at Princeton. Between 2009 and 2015, he was a doctoral student in theoretical condensed matter physics in professor Karyn Le Hur’s group at Yale and Ecole Polytechnique, Paris.

Abstract: With recent advances in state preparation, gate, and measurement operations, superconducting circuit architectures are now leading candidates for quantum information processing. As micro-fabricated circuits are scaled up towards a practical quantum processor, strict requirements on the fidelity of operations required for quantum computation are imposed. For theorists, this mandates the development of accurate models describing the dynamics of complex superconducting circuits subject to strong drives.

This talk will begin with an elementary introduction to such systems and their description in terms of quantum electrodynamics, the fundamental theory of light-matter interactions. We will then address the problem of the Purcell effect, which is the enhancement of the decay rate of a single qubit due to a linear electromagnetic environment, and show how convergent results can be obtained without any artificial high-frequency cutoffs. We will also explain how the Purcell rate is further enhanced in the presence of the drive fields typically used to measure qubits, which is a ubiquitous problem encountered in present-day experiments.


This event was first published on March 3, 2020 and last updated on March 11, 2020.

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