Session Q30: Focus Session: Superconducting Qubits: Architecture, Tunable, and Static Coupling
11:15 AM–2:15 PM, Wednesday, February 29, 2012
Room: 259B
Sponsoring Unit:
GQI
Chair: Chad Rigetti, IBM, Yorktown Heights, NY
Abstract ID: BAPS.2012.MAR.Q30.11
Abstract: Q30.00011 : Transferring the state of a quantum register to a single oscillator: a simple circuit verses numerical optimization
1:39 PM–1:51 PM
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Abstract 
Authors:
Kurt Jacobs
(University of Massachusetts at Boston)
Xiaoting Wang
(University of Massachusetts at Boston)
Frederick Strauch
(Williams College)
We consider the problem of swapping a quantum state between a register of qubits and a single quantum oscillator. We design a mesoscopic quantum circuit to do this, using an off-resonant interaction, based on the concept of coherent feedback control. We consider an explicit realization of this circuit, and perform simulations of its performance. We then take a different approach, in which we couple the register directly to the resonator, including inter-qubit couplings and local controls, and use numerical optimization to search for a control protocol that will achieve the swap with very high fidelity. Our results show that the protocols found using numerical searches are superior in speed and fidelity to the manually-designed circuit. We also explore how the time and complexity of the protocols increases with the problem size.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.Q30.11