Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Quantum Coherence, Quantum Information Systems 2

TT 42.13: Vortrag

Mittwoch, 13. März 2013, 18:45–19:00, H18

Understanding and utilizing phase qubit decoherence channels for microwave photon detection — •Emily Pritchett, Luke Govia, and Frank Wilhelm — Saarland University

Superconducting phase qubits are a leading platform for storing and processing quantum information. While extremely promising, phase qubits experience unexpectedly short lifetimes as compared to other superconducting qubits (e.g, the transmon), which is explained by the experimental observation of densely packed anti-crossings in the phase qubit's spectrum. While currently thought the result of interactions between the qubit and spurious defects in its environment, we show that these anti-crossings exist between the qubit state and other nearly-degenerate eigenstates of the circuit even before interaction with the environment is considered. We discuss how the instability introduced by these in-circuit resonances can be utilized for high-efficiency, high-bandwidth single microwave photon detection.