Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: Symposium: Circuit QED

TT 27.4: Vortrag

Donnerstag, 28. Februar 2008, 10:55–11:20, H 0104

Engineering coherent quantum states in superconducting systems — •Raymond W Simmonds — National Institute of Standards and Technology, Division 817.03, 325 Broadway St. Boulder, CO 80305 USA

Recently, we have taken the first step towards creating and controlling quantum information using superconducting circuits. We have observed for the first time a coherent interaction between two superconducting "atoms'' (quantum bits or qubits) and an LC cavity formed by a 7 mm long coplanar waveguide resonant at approximately 9 GHz. When either qubit is resonant with the cavity, we observe the vacuum Rabi mode splitting of the qubit's spectral line. In a time-domain measurement, we observe coherent vacuum Rabi oscillations between either qubit and the resonator. Using controllable shift pulses, we have shown coherent transfer of a arbitrary quantum state. We prepare the first qubit in a superposition state, then this state is transferred to the resonant cavity and then after a short time, we transfer this state into the second qubit. These experiments show that developing custom designed quantum systems on chip is possible, opening up new possibilities for studying quantum mechanics and information science.