Decoherence dynamics of complex photon states in a superconducting circuit

Wang, H. et al. (2009) Decoherence dynamics of complex photon states in a superconducting circuit. Physical Review Letters, 103(20), 200404. (doi:10.1103/PhysRevLett.103.200404) (PMID:20365967)

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Quantum states inevitably decay with time into a probabilistic mixture of classical states due to their interaction with the environment and measurement instrumentation. We present the first measurement of the decoherence dynamics of complex photon states in a condensed-matter system. By controllably preparing a number of distinct quantum-superposed photon states in a superconducting microwave resonator, we show that the subsequent decay dynamics can be quantitatively described by taking into account only two distinct decay channels: energy relaxation and pure dephasing. Our ability to prepare specific initial quantum states allows us to measure the evolution of specific elements in the quantum density matrix in a very detailed manner that can be compared with theory.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Weides, Professor Martin
Authors: Wang, H., Hofheinz, M., Ansmann, M., Bialczak, R.C., Lucero, E., Neeley, M., O’Connell, A.D., Sank, D., Weides, M., Wenner, J., Cleland, A.N., and Martinis, J. M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114

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