RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

Parametric Amplification of Quantum Signals with Superconducting Tunnel Junction Circuits

January 28, 2013 - 12:30pm
Michel Devoret
Yale University

Abstract: Quantum Mechanics puts a limit on how small the degradation of information passing through an amplifier can be. It is known theoretically that the minimum noise added to the signal by an amplifier, operating in the usual in phase preserving mode, amounts to at least half a photon at the signal frequency. Is it possible to construct an amplifier working at microwave frequencies that would reach this quantum limit and still be practical in terms of gain, bandwidth and dynamical range? We will present recent work by our group answering positively this question, which is of crucial importance for the readout of solid state qubits, and more generally, for measurements of very weak electromagnetic signals in various areas of science.

1201 Physics Building
College Park, MD 20742

Subscribe to A Quantum Bit 

Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...

Sign Up Now

Sign up to receive A Quantum Bit in your email!

 Have an idea for A Quantum Bit? Submit your suggestions to