Location: Room E

Time: 12:45 hrs -- including lunch -- 

Bio: DiCarlo got his PhD at Harvard from the Marcus group and is now postdoc at Yale in the Schoelkopf group. DiCarlo has recently been successful in running quantum logic on a superconducting (transmon circuit), for instance reported in this paper in Nature: http://www.nature.com/nature/journal/v460/n7252/pdf/nature08121.pdf

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Quantum Algorithms and Entanglement Metrology with Superconducting Circuits

Dr. Leonardo DiCarlo, Department of Applied Physics, Yale University

Quantum computers may one day outperform their modern counterparts in solving problems of technological impact, such as factoring large numbers and searching databases. In this talk, I will present the experimental implementation of two-qubit quantum algorithms using a superconducting integrated circuit. This rudimentary quantum processor uses a microwave transmission-line cavity as a quantum bus coupling two qubits several millimeters apart. Measurements of cavity transmission give direct access to qubit-qubit correlations, enabling entanglement detection and tomography of the two-qubit state. I will present on-demand generation of highly entangled (Bell) states using conditional-phase gates, and their characterization via entanglement witnesses and violation of Clauser-Horne-Shimony-Holt-type inequalities. I will next present the implementation of Grover search and Deutsch-Jozsa quantum algorithms, using state tomography as a quantum debugging tool showing how the processor uses quantum superposition and entanglement to process information. Finally, I will discuss current efforts to couple more qubits with the bus and survey exciting challenges ahead on the road to implementing more complex quantum algorithms.