We discuss a cubit circuit based on the single Cooper-pair transistor (which consists of two ultrasmall Josephson junctions in series) connected in parallel with a large Josephson junction. The switching of this junction out of its zero-voltage state is used to readout the qubit, We report measurements of the discriminating power of the readout process, and we discuss its back-action on the qubit. (C) 2002 Elsevier Science B.V. All rights reserved.
机构:
Nanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
S China Normal Univ, Sch Phys & Telecommun Engn, Inst Condensed Matter Phys, Guangzhou 510631, Peoples R ChinaNanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
Feng, Zhi-Bo
Zhang, Xin-Ding
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S China Normal Univ, Sch Phys & Telecommun Engn, Inst Condensed Matter Phys, Guangzhou 510631, Peoples R ChinaNanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
机构:
Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Xu, Y.
Hua, Z.
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Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Hua, Z.
Chen, Tao
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South China Normal Univ, Guangdong Prov Key Lab Quantum Engn & Quantum Mat, GPETR Ctr Quantum Precis Measurement, Guangzhou 510006, Peoples R China
South China Normal Univ, Sch Phys & Telecommun Engn, Guangzhou 510006, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Chen, Tao
Pan, X.
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Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Pan, X.
Li, X.
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Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Li, X.
Han, J.
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Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Han, J.
Cai, W.
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Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Cai, W.
Ma, Y.
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Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Ma, Y.
Wang, H.
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Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Wang, H.
Song, Y. P.
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Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Song, Y. P.
Xue, Zheng-Yuan
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机构:
South China Normal Univ, Guangdong Prov Key Lab Quantum Engn & Quantum Mat, GPETR Ctr Quantum Precis Measurement, Guangzhou 510006, Peoples R China
South China Normal Univ, Sch Phys & Telecommun Engn, Guangzhou 510006, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China
Xue, Zheng-Yuan
Sun, L.
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Tsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R ChinaTsinghua Univ, Ctr Quantum Informat, Inst Interdisciplinary Informat Sci, Beijing 100084, Peoples R China