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Volumn 93, Issue 10, 2004, Pages

Measurement efficiency and n-shot readout of spin qubits

Author keywords

[No Author keywords available]

Indexed keywords

DATA PROCESSING; ELECTROMETERS; ERROR DETECTION; FERMI LEVEL; FERROMAGNETISM; MAGNETIC COUPLINGS; MATHEMATICAL OPERATORS; OSCILLATIONS; PARAMAGNETIC RESONANCE; PROBABILITY; TRANSISTORS;

EID: 19544393144     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.93.106804     Document Type: Article
Times cited : (56)

References (31)
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    • Kluwer Academic, Amsterdam
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    • (1993) Quantum Theory
    • Peres, A.1
  • 5
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    • note
    • 1.
  • 6
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    • note
    • 1).
  • 8
    • 85088490201 scopus 로고    scopus 로고
    • note
    • n. Thus, n ≥ log(α)/log(1 - e) is sufficient for readout.
  • 9
    • 85088492284 scopus 로고    scopus 로고
    • note
    • 1/k in Eq. (1) and find that n ≥ 2(1/e - 1) logk/β is sufficient.
  • 15
    • 0037092766 scopus 로고    scopus 로고
    • H.-A. Engel and D. Loss, Phys. Rev. Lett. 86, 4648 (2001); Phys. Rev. B 65, 195321 (2002).
    • (2002) Phys. Rev. B , vol.65 , pp. 195321
  • 16
    • 4944251658 scopus 로고    scopus 로고
    • note
    • Instead of a reference dot, the qubit dot can be coupled to a lead. To ensure that only electrons with, say, spin ↓ can tunnel, one can use spin-polarized leads or a Zeeman splitting on the dot and properly tuned energy levels [14].
  • 21
    • 0001345434 scopus 로고
    • This can be generated with (i) locally different magnetic fields. Or, with an inhomogeneous g factor as follows. (ii) Spatial variation of dot location in a heterostructure, i.e., moving electrons up/down by gates, etc. (iii) Similarly, produce a spatial variation with different orbital states by filling each dot with a different number of electrons, (iv) Different hyperfine interaction in each dot, say, by inducing a nuclear polarization in one dot by the QPC current (v) Different Rashba interaction, (vi) optical Stark effect [C. Cohen-Tannoudji and J. Dupont-Roc, Phys. Rev. A 5, 968 (1972); J. A. Gupta et al., Science 292, 2458 (2001) ], or (vii) differently distributed magnetic impurities in each dot.
    • (1972) Phys. Rev. A , vol.5 , pp. 968
    • Cohen-Tannoudji, C.1    Dupont-Roc, J.2
  • 22
    • 0035968004 scopus 로고    scopus 로고
    • This can be generated with (i) locally different magnetic fields. Or, with an inhomogeneous g factor as follows. (ii) Spatial variation of dot location in a heterostructure, i.e., moving electrons up/down by gates, etc. (iii) Similarly, produce a spatial variation with different orbital states by filling each dot with a different number of electrons, (iv) Different hyperfine interaction in each dot, say, by inducing a nuclear polarization in one dot by the QPC current (v) Different Rashba interaction, (vi) optical Stark effect [C. Cohen-Tannoudji and J. Dupont-Roc, Phys. Rev. A 5, 968 (1972); J. A. Gupta et al., Science 292, 2458 (2001) ], or (vii) differently distributed magnetic impurities in each dot.
    • (2001) Science , vol.292 , pp. 2458
    • Gupta, J.A.1
  • 23
    • 4944252351 scopus 로고    scopus 로고
    • note
    • Assuming ergodicity, the (ensemble-averaged) stationary current 7 is equal to the time-averaged current of a single measurement run.
  • 24
    • 0037162826 scopus 로고    scopus 로고
    • K. Ono et al., Science 297, 1313 (2002).
    • (2002) Science , vol.297 , pp. 1313
    • Ono, K.1
  • 25
    • 4944265154 scopus 로고    scopus 로고
    • H.-A. Engel et al., cond-mat/0309023
    • H.-A. Engel et al., cond-mat/0309023.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.