Controlling the Spontaneous Emission of a Superconducting Transmon Qubit

Overview

Journal Phys Rev Lett

Publisher American Physical Society

Specialty Biophysics

Date 2008 Sep 4

PMID 18764596

Citations 21

Authors

A A Houck

J A Schreier

B R Johnson

J M Chow

Jens Koch

J M Gambetta

D I Schuster

L Frunzio

M H Devoret

S M Girvin

R J Schoelkopf

Affiliations

Soon will be listed here.

Abstract

We present a detailed characterization of coherence in seven transmon qubits in a circuit QED architecture. We find that spontaneous emission rates are strongly influenced by far off-resonant modes of the cavity and can be understood within a semiclassical circuit model. A careful analysis of the spontaneous qubit decay into a microwave transmission-line cavity can accurately predict the qubit lifetimes over 2 orders of magnitude in time and more than an octave in frequency. Coherence times T1 and T_{2};{*} of more than a microsecond are reproducibly demonstrated.

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