Superconducting qubits coupled to nanoelectromechanical resonators: An architecture for solid-state quantum-information processing

Journal Article · Tue Mar 01 04:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.032311· OSTI ID:20650349

Geller, M R ^[1]; Cleland, A N ^[2]

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1. Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602-2451 (United States)
2. Department of Physics, University of California, Santa Barbara, California 93106 (United States)

We describe the design for a scalable, solid-state quantum-information-processing architecture based on the integration of GHz-frequency nanomechanical resonators with Josephson tunnel junctions, which has the potential for demonstrating a variety of single- and multiqubit operations critical to quantum computation. The computational qubits are eigenstates of large-area, current-biased Josephson junctions, manipulated and measured using strobed external circuitry. Two or more of these phase qubits are capacitively coupled to a high-quality-factor piezoelectric nanoelectromechanical disk resonator, which forms the backbone of our architecture, and 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, unlike existing approaches using atoms in electromagnetic cavities, here we can individually tune the level spacing of the 'atoms' and control their 'electromagnetic' interaction strength. We show theoretically 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. Many such junction-resonator complexes can be assembled in a hub-and-spoke layout, resulting in a large-scale quantum circuit. Our proposed architecture combines desirable features of both solid-state and cavity quantum electrodynamics approaches, and could make quantum-information processing possible in a scalable, solid-state environment.

• OSTI ID: 20650349
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
COMPUTER ARCHITECTURE
CONTROL
COUPLING
CRYSTALS
DATA PROCESSING
EIGENSTATES
ELECTROMAGNETIC INTERACTIONS
GHZ RANGE
INFORMATION THEORY
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
NANOSTRUCTURES
PIEZOELECTRICITY
QUALITY FACTOR
QUANTUM ELECTRODYNAMICS
QUANTUM MECHANICS
SOLIDS
SUPERCONDUCTING CAVITY RESONATORS