Southwest Quantum Information and Technology

Tenth Annual Meeting, February 14-17, 2008
University of New Mexico, Santa Fe, New Mexico

Full Program | Thursday Tutorials | Friday | Saturday | Sunday

SESSION 7: Quantum Computing I: Experiment
Session Chair: John Martinis
10:45-11:30	Raymond Simmonds, National Institute of Standards and Technology (invited)
	Engineering coherent quantum states in superconducting systems
	Abstract. Wouldn't it be great to custom design your own individual quantum systems, then connect them up in interesting arrangements and play around with quantum mechanics? 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 ~9 GHz. When either qubit is resonant with the cavity, we observe the vacuum Rabi splitting of the qubit's spectral line. In a time-domain measurement, we observe coherent vacuum Rabi oscillations between either qubit and the oscillator. Using controllable shift pulses, we have shown coherent transfer of a arbitrary quantum state. We first 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 final qubit. These experiments show that developing custom designed quantum systems on chip is possible, opening up new possibilities for studying quantum mechancis and information science.
11:30-12:00	Jason Amini, National Institute of Standards and Technology
	Scalable Traps and Novel Gates for Quantum Information Processing with Ions
	Abstract. Two of the key goals for the ion trap community are scaling ion traps to hold and manipulate the numbers of qubits needed for useful algorithms and improving the quality of all operations. At NIST, we are testing an 18-zone two-layer trap with an "X" intersection and employing microfabrication techniques to simplify the design and construction of future traps [1]. Combined with novel optical and magnetic gates [2], sympathetic cooling [3], and quantum enabled read-out [4] utilizing different ion species, algorithms with large numbers of ions may become tractable. We have also demonstrated cooling of a microcantilever using an RF resonant circuit [5] and are pursuing the coupling of ions to cantilevers for cooling and entanglement. [1] See the poster by J. Britton, et al. [2] See the poster by C. Ospelkaus, et al. See also, D. Leibfried, et al., Phys. Rev. A 76, 032324 (2007). [3] See the poster by J. Jost, et al. [4] See the poster by D. Hume, et al. [5] K.R. Brown, et al., Phys. Rev. Lett. 99, 137205 (2007).