dorsal/arxiv
View SchemaSuperconducting Qubits Coupled to Nanoelectromechanical Resonators: An Architecture for Solid-State Quantum Information Processing
| Authors | Michael R. Geller, Andrew N. Cleland |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0409179 |
| URL | https://arxiv.org/abs/quant-ph/0409179 |
| DOI | 10.1103/PhysRevA.71.032311 |
Abstract
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 multi-qubit 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 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.
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"abstract": "We describe the design for a scalable, solid-state\nquantum-information-processing architecture based on the integration of\nGHz-frequency nanomechanical resonators with Josephson tunnel junctions, which\nhas the potential for demonstrating a variety of single- and multi-qubit\noperations critical to quantum computation. The computational qubits are\neigenstates of large-area, current-biased Josephson junctions, manipulated and\nmeasured using strobed external circuitry. Two or more of these phase qubits\nare capacitively coupled to a high-quality-factor piezoelectric\nnanoelectromechanical disk resonator, which forms the backbone of our\narchitecture, and which enables coherent coupling of the qubits. The integrated\nsystem is analogous to one or more few-level atoms (the Josephson junction\nqubits) in an electromagnetic cavity (the nanomechanical resonator). However,\nunlike existing approaches using atoms in electromagnetic cavities, here we can\nindividually tune the level spacing of the ``atoms\u0027\u0027 and control their\n``electromagnetic\u0027\u0027 interaction strength. We show theoretically that quantum\nstates prepared in a Josephson junction can be passed to the nanomechanical\nresonator and stored there, and then can be passed back to the original\njunction or transferred to another with high fidelity. The resonator can also\nbe used to produce maximally entangled Bell states between a pair of Josephson\njunctions. Many such junction-resonator complexes can assembled in a\nhub-and-spoke layout, resulting in a large-scale quantum circuit. Our proposed\narchitecture combines desirable features of both solid-state and cavity quantum\nelectrodynamics approaches, and could make quantum information processing\npossible in a scalable, solid-state environment.",
"arxiv_id": "quant-ph/0409179",
"authors": [
"Michael R. Geller",
"Andrew N. Cleland"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.71.032311",
"title": "Superconducting Qubits Coupled to Nanoelectromechanical Resonators: An Architecture for Solid-State Quantum Information Processing",
"url": "https://arxiv.org/abs/quant-ph/0409179"
},
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