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CQED Susceptibility of Superconducting Transmons coupled to a Microstrip Resonator Cavity David Pappas, Martin Sandberg, Jiansong Gao, Michael Vissers.

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Presentation on theme: "CQED Susceptibility of Superconducting Transmons coupled to a Microstrip Resonator Cavity David Pappas, Martin Sandberg, Jiansong Gao, Michael Vissers."— Presentation transcript:

1 cQED Susceptibility of Superconducting Transmons coupled to a Microstrip Resonator Cavity David Pappas, Martin Sandberg, Jiansong Gao, Michael Vissers NIST, Boulder, CO Anton Kockum, Goran Johansson Chalmers University of Technology, G ӧ teborg, Sweden

2 Outline What do you do when your qubit frequency is too close to your cavity? “Quantum art” Response of a coupled qubit-cavity system to a strong drive at finite temperature – Singly dressed - qubit + cavity – Doubly dressed system – qubit+cavity+ drive two photon processes – Triply dressed three photon processes

3 “2½D” - Transmon coupled to microstrip cavity Sandberg, et al., APL 102, (2013) Qubit

4 Cavity response to a probe tone VNA S 21 probe 1 2 Measure transmission, S 21 at T ∽ 100 mK Susceptibility of the system frequency & power dependence High power – bare cavity Low power – excitation spectrum of “singly dressed” qubit+cavity cavity Qubit-cavity excitations High power Low power

5 Model with Jaynes-Cummings Hamiltonian Excitation spectrum TransitionFrequency (GHz)

6 Line identification TransitionFrequency (GHz) cavity Use low power probe tone to measure the system Add high power drive (i.e. pump) for susceptibilty

7 Susceptibility measurement VNA S 21 probe 1 2 drive Drive tone, D (GHz)


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