Theorie Kolloquium | January 17, 16:30
Non-reciprocity in near-term quantum platforms
Reciprocity relates cause and effect at two points in a system. In a reciprocal system, a disturbance at A is felt at B with the same intensity as a disturbance at B would be felt at A. Somewhat surprisingly, this innocuous relation has far-reaching consequences: for example, relations between transport coefficients. Breaking reciprocity breaks these relations and opens up a world of new steady-state behaviors, such as macroscopic oscillations and persistent currents. Controlling non-reciprocal effects provides a short-term goal for quantum simulators in which non-reciprocity can be readily achieved using drives and dissipation, and an intriguing route to engineering devices, such as circulators and isolators, needed for future quantum technologies. I will describe how to use non-reciprocal responses of band structures to achieve useful non-reciprocal effects in qubit-cavity platforms. We will obtain topological photon pumps, topologically protected circulating photons and ways to ‘boost’ non-classical cavity states to larger photon number. I will conclude with a status update on ongoing experimental efforts based on our approach in superconducting circuits.
Boston University
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Contact: Silvia Pappalardi