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Bulletin of the American Physical Society

Junction Resonances in Josephson Phase Qubits

John M. Martinis, R. McDermott, Ken B. Cooper, Matthias Steffen, M. Ansmann, Kevin D. Osborn, K. Cicak, S. Oh, David P. Pappas, Raymond W. Simmonds

Published Mar 25, 2005• 0 citations
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We describe the design for a solid‐state quantum computational architecture based on the integration of GHz‐frequency mechanical resonators with Josephson phase qubits, which have the potential for demonstrating a variety of single‐ and multi‐qubit operations critical to quantum computation. The computational qubits are eigenstates of large‐area, current‐biased Josephson junctions. Two or more qubits are capacitively coupled to a piezoelectric nanoelectromechanical disk resonator, which enables coherent coupling of the qubits. The integrated system is analogous to one or more few‐level atoms (the Josephson junction qubits) in an electromagnetic cavity (the nanomechanical resonator). However, here we can individually tune the level spacing of the “atoms” and control their “electromagnetic” interaction strength. We show that quantum states prepared in a Josephson junction can be passed to the nanomechanical resonator and stored there, and then can be passed back to the original junction or transferred to another with high fidelity. The resonator can also be used to produce maximally entangled Bell states between a pair of Josephson junctions.
Two-level system fluctuators (TLS's) in the tunnel barrier of a Josephson junction have recently been demonstrated to cause novel energy splittings in spectroscopic measurements of superconducting phase qubits. With their strong coupling to the Josephson junction and relatively long decoherence times, TLS's can be considered as potential qubits and demonstrate coherent quantum effects. Here, we study the effective interaction between the TLS qubits that is mediated by a Josephson junction resonator driven by an external microwave source. This effective interaction can enable controlled quantum logic gates between the TLS's. Our study can be extended to other superconducting resonators coupling with TLS's.