Controlling the spontaneous emission of a superconducting transmon qubit

Details Controlling the spontaneous emission of a superconducting transmon qubit Controlling the spontaneous emission of a superconducting transmon qubit

2008-03-31

arxiv.org/abs/0803.4490v1

Phys. Rev. Lett. 101, 080502 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.080502

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 two orders of magnitude in time and more than an octave in frequency. Coherence times $T_1$ and $T_2^*$ of more than a microsecond are reproducibly demonstrated.

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