Quantum physics with electrical circuits
Dr. Daniel Esteve, Quantronics School, CEA-Saclay, France
- 17 May 2013 11:00
Solid state electrical circuits that behave as artificial quantum atoms are now fabricated for processing quantum information, and for addressing fundamental issues in quantum mechanics. I will describe how a simple superconducting artificial atom, the Cooper pair box, embedded in a microwave cavity just as atoms are in cavity QED physics, provides a playground for quantum mechanics and an operational quantum bit. In this talk, I will give an overview of superconducting qubit circuits, and will discuss some quantum physics experiments.
In a single qubit circuit measured and driven at the same time, we have demonstrated the violation of the Leggett and Garg inequality which falsifies the assumptions of macrorealism, considered as plausible for macroscopic systems such as electrical circuits. With an elementary quantum processor, we have demonstrated the quantum speed-up expected from quantum computing in the simple case of the Grover search algorithm. By coupling an ensemble of microscopic electronic spins and a qubit and to a same microwave cavity, we have demonstrated the operation of a quantum memory based on spin ensembles.
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