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Physics Department Colloquia

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Events on Friday, February 7th, 2014

Quantum Optics with Microwave Photons
Time: 3:30 pm
Place: 2241 Chamberlin Hall (coffee at 4:30 pm)
Speaker: Maxim Vavilov, University of Wisconsin Department of Physics
Abstract: Recent experiments revealed the quantum nature of electromagnetic fields of superconducting circuits at microwave frequencies.

Individual quanta of these fields are photons with energy a few million times smaller than the energy of an optical photon and are extremely hard to detect. A promising device for microwave photon detection is based on Josephson junctions. Even a single microwave photon with tiny energy is sufficient to switch a junction from the superconducting to voltage state, and detection of a photon reduces to observation of voltage pulses across the junction.

In this talk, I will present a theoretical model of a Josephson junction interacting with a quantized electromagnetic field and show that such Josephson photon detectors have relatively high efficiency of detection of microwave photons. I will discuss application of such detectors to qubit readout for quantum information processing and to studies of photon emission statistics by quantum electronic devices.
Poster: https://www.physics.wisc.edu/events/posters/2014/3281.pdf
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