Quantum mechanics is at the heart of our technology and economy - the laser and the transistor are quantum devices - but its full potential is far from being realized. Recent technological advances in optics, nanoscience and engineering allow experimentalists to create artificial structures or put microscopic and mesoscopic systems under new manipulable conditions in which quantum phenomena play a fundamental role.

Quantum technologies exploit these effects with practical purposes. The objective of Quantum Science is to discover, study, and control quantum efects at a fundamental level. These are two sides of a virtuous circle: new technologies lead to the discovery and study of new phenomena that will lead to new technologies.

Our group's aim is  to control and understand quantum phenomena in a multidisciplinary intersection of  Quantum Information, Quantum optics and cold atoms, Quantum Control, Spintronics, Quantum metrology, Atom interferometry, Superconducting qubits and Circuit QED and Foundations of Quantum Mechanics.



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Dr. Pol Forn-Díaz (Seminar)

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2010/11/09, Dr. Pol Forn-Díaz

Place:  Sala de Seminarios del Departamento de Física Teórica e Historia de la Ciencia
Time: 12h.
Title: Physics beyond the rotating-wave approximation in superconducting quantum circuits

Quantum effects in superconducting circuits have been a focus of intense study during the past years. Progress has been made to couple several superconducting quantum bits (qubits) to each other and to perform quantum gates between them. Coupling to on-chip superconducting resonators has also been achieved. This has opened the possibility of coupling remote qubits to each other using the resonator as a coupler. At the same time, coupling qubits to resonators allows studying the qubit-photon interaction to regimes of parameters unattainable in the experiments of cavity quantum electrodynamics (QED) in quantum optics. In this talk I will present the superconducting flux qubit in the context of circuit QED. A system consisting of a flux qubit very strongly coupled to an LC resonator will be presented. It will be shown that the magnitude of the coupling allows the observation of Bloch-Siegert shifts. These shifts correspond to energy corrections in the qubit and the photon beyond the rotating-wave approximation in the Jaynes-Cummings model.