COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |

University of Cambridge > Talks.cam > Theory of Condensed Matter > Photon-Instanton Collider Implemented by a Superconducting Circuit: Splitting a Single Photon

## Photon-Instanton Collider Implemented by a Superconducting Circuit: Splitting a Single PhotonAdd to your list(s) Download to your calendar using vCal - Moshe Goldstein (Tel Aviv University)
- Thursday 26 May 2022, 14:00-15:00
- Details of video conferencing will be distributed nearer the time..
If you have a question about this talk, please contact Jan Behrends. How would our world look like if the fine structure constant α were of order unity? While in our small α world an atom excited to the first excited state has negligible probability of decaying to the ground state while emitting more than a single photon, such processes are important in a large α world, making photon frequency conversion effective in the single-photon regime. We show how such behavior can be realized in a superconducting circuit QED system, where a transmon, which serves as an artificial atom, is galvanically coupled to a high-impedance Josephson junction array, which acts as a waveguide for microwave photons with a high effective α. Instantons (phase slips) that occur in the transmon interact with the microwave photons, and lead to inelastic scattering probabilities which approach unity and greatly exceed the effect of the quartic anharmoncity of the Josephson potential [1]. The instanton-photon cross section is calculated using a novel formalism which allows to directly observe the dynamical properties of the instantons, and should be useful in other quantum field theoretical contexts. The calculated inelastic decay rates compare well with recent measurements from the Manucharyan group at Maryland [2]. I will also show how this effects can be used to shed a single-photon light on the Bulgadaev-Schmid superconductor-to-insulator transition in the transmon, which has been the center of a recent controversy. References: [1] Photon-instanton collider implemented by a superconducting circuit, A. Burshtein, R. Kuzmin, V. E. Manucharyan, and M. Goldstein, Phys. Rev. Lett. 126 137701 (2021). [2] Photon decay in circuit quantum electrodynamics, R. Kuzmin, N. Grabon, N. Mehta, A. Burshtein, M. Goldstein, M. Houzet, L. I. Glazman, and V. E. Manucharyan, Phys. Rev. Lett. 126, 197701 (2021). This talk is part of the Theory of Condensed Matter series. ## This talk is included in these lists:- All Cavendish Laboratory Seminars
- All Talks (aka the CURE list)
- Centre for Health Leadership and Enterprise
- Combined TCM Seminars and TCM blackboard seminar listing
- Details of video conferencing will be distributed nearer the time.
- Featured lists
- Lennard-Jones Centre external
- ME Seminar
- Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
- PMRFPS's
- School of Physical Sciences
- Theory of Condensed Matter
- Thin Film Magnetic Talks
- few29
Note that ex-directory lists are not shown. |
## Other listsWinton Journal Club Central Medieval Graduate Workshop NanoDTC Energy Materials Talks## Other talksThe neural correlates of ongoing conscious thought The effect of intermittency on regularity properties of the solutions to the Navier-Stokes equations Reconstructing CO2 change on 100 to 100 million year timescales Strategic Default and Renegotiation: Evidence from Commercial Real Estate Loans Science & Engineering Covid and Cognition |