Fast tuning of superconducting microwave cavities
- Department of Microtechnology and Nanoscience, Chalmers University of Technology, 412 96 Goeteborg (Sweden)
Photons are fundamental excitations of electromagnetic fields and can be captured in cavities. For a given cavity with a certain size, the fundamental mode has a fixed frequency f which gives the photons a specific 'color'. The cavity also has a typical lifetime {tau}, which results in a finite linewidth {delta}f. If the size of the cavity is changed fast compared to {tau}, and so that the frequency change {delta}f>>{delta}f, then it is possible to change the 'color' of the captured photons. Here we demonstrate superconducting microwave cavities, with tunable effective lengths. The tuning is obtained by varying a Josephson inductance at one end of the cavity. We show data on four different samples and demonstrate tuning by several hundred linewidths in a time {delta}t<<{tau}. Working in the few photon limit, we show that photons stored in the cavity at one frequency will leak out from the cavity with the new frequency after the detuning. The characteristics of the measured devices make them suitable for different applications such as dynamic coupling of qubits and parametric amplification.
- OSTI ID:
- 21254854
- Journal Information:
- AIP Conference Proceedings, Vol. 1074, Issue 1; Conference: 2. international workshop on solid-state quantum computing and mini-school on quantum information science, Taipei, Taiwan (China), 23-27 Jun 2008; Other Information: DOI: 10.1063/1.3037127; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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