dorsal/arxiv
View SchemaQuantum computing and quantum measurement with mesoscopic Josephson junctions
| Authors | D. V. Averin |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0008114 |
| URL | https://arxiv.org/abs/quant-ph/0008114 |
| DOI | 10.1002/1521-3978(200009)48:9/11<1055::AID-PROP1055>3.0.CO;2-1 |
Abstract
Recent experimental demonstrations of quantum coherence of the charge and flux states of Josephson junctions show that the quantum Josephson dynamics can be used to develop scalable quantum logic circuits. In this work, I review the basic concepts of Josephson tunneling and Josephson-junction qubits, and discuss two problems of this tunneling motivated by quantum computing applications. One is the theory of photon-assisted resonant flux tunneling in SQUID systems used to demonstrate quantum coherence of flux. Another is the problem of quantum measurement of charge with the SET electrometer. It is shown that the SET electrometer at the Coulomb blockade threshold is the quantum-limited detector with energy sensitivity reaching $\hbar/\sqrt{3}$ in the resonant-tunneling regime.
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"abstract": "Recent experimental demonstrations of quantum coherence of the charge and\nflux states of Josephson junctions show that the quantum Josephson dynamics can\nbe used to develop scalable quantum logic circuits. In this work, I review the\nbasic concepts of Josephson tunneling and Josephson-junction qubits, and\ndiscuss two problems of this tunneling motivated by quantum computing\napplications. One is the theory of photon-assisted resonant flux tunneling in\nSQUID systems used to demonstrate quantum coherence of flux. Another is the\nproblem of quantum measurement of charge with the SET electrometer. It is shown\nthat the SET electrometer at the Coulomb blockade threshold is the\nquantum-limited detector with energy sensitivity reaching $\\hbar/\\sqrt{3}$ in\nthe resonant-tunneling regime.",
"arxiv_id": "quant-ph/0008114",
"authors": [
"D. V. Averin"
],
"categories": [
"quant-ph",
"cond-mat"
],
"doi": "10.1002/1521-3978(200009)48:9/11\u003c1055::AID-PROP1055\u003e3.0.CO;2-1",
"title": "Quantum computing and quantum measurement with mesoscopic Josephson junctions",
"url": "https://arxiv.org/abs/quant-ph/0008114"
},
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