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, Issue.4
, pp. 1-4
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Faoro, L.1
Bergli, J.2
Altshuler, B.L.3
Galperin, Y.M.4
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52
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77954822403
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We excluded a constant term that does not play any role in the system dynamics.
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We excluded a constant term that does not play any role in the system dynamics.
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53
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77954829274
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arXiv:0909.4116 (unpublished).
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Guy Ramon and Xuedong Hu, arXiv:0909.4116 (unpublished).
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Ramon, G.1
Hu, X.2
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54
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We do not expect that a choice of a spheical symmetric TLS wavefunction will induce any qualitative change in our results.
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We do not expect that a choice of a spheical symmetric TLS wavefunction will induce any qualitative change in our results.
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55
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77954829486
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When tunneling between the TLS centers is introduced the TLS eigenstates become (L±R ) /√2 (for ωT =0) and contributions from off-diagonal TLS states become appreciable. The qubit-TLS coupling then produces additional terms in the interaction Hamiltonian (Eq. ) of the form σxT ⊗- σzQ, σxT ⊗- IQ. Assuming the TLS is unbiased there is no TLS dipole term and the leading contribution comes from the TLS quadrupole term, which is calculated to be very small for the TLS tunneling values assumed in this paper.
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When tunneling between the TLS centers is introduced the TLS eigenstates become (L ± R) / √ 2 (for ω T = 0) and contributions from off-diagonal TLS states become appreciable. The qubit-TLS coupling then produces additional terms in the interaction Hamiltonian (Eq.) of the form σ x T ⊗- σ z Q, σ x T ⊗- I Q. Assuming the TLS is unbiased there is no TLS dipole term and the leading contribution comes from the TLS quadrupole term, which is calculated to be very small for the TLS tunneling values assumed in this paper.
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56
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0004179874
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See, e.g., 2nd ed. (Wiley, New York
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See, e.g., J. D. Jackson, Classical Electrodynamics, 2nd ed. (Wiley, New York, 1975), Chap..
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(1975)
Classical Electrodynamics
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Jackson, J.D.1
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57
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19744381864
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10.1103/PhysRevLett.93.186802
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J. R. Petta, A. C. Johnson, C. M. Marcus, M. P. Hanson, and A. C. Gossard, Phys. Rev. Lett. 93, 186802 (2004). 10.1103/PhysRevLett.93.186802
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(2004)
Phys. Rev. Lett.
, vol.93
, pp. 186802
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Petta, J.R.1
Johnson, A.C.2
Marcus, C.M.3
Hanson, M.P.4
Gossard, A.C.5
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58
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33846656370
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Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling
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DOI 10.1103/PhysRevLett.98.050502
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R. Hanson and G. Burkard, Phys. Rev. Lett. 98, 050502 (2007). 10.1103/PhysRevLett.98.050502 (Pubitemid 46198306)
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(2007)
Physical Review Letters
, vol.98
, Issue.5
, pp. 050502
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Hanson, R.1
Burkard, G.2
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We have verified that switching times ≲1ns, comparable to experimentally used bias sweep times, do not contribute appreciably to gate errors in most cases, and in any case can be corrected by a careful pulse design. To isolate the effects of qubit-TLS coupling we have nevertheless considered very short switching times (∼1ps ).
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We have verified that switching times ≲ 1ns, comparable to experimentally used bias sweep times, do not contribute appreciably to gate errors in most cases, and in any case can be corrected by a careful pulse design. To isolate the effects of qubit-TLS coupling we have nevertheless considered very short switching times (∼ 1ps).
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60
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Throughout most of the parameter ranges presented in Figure 7, tT >Γ thus the TLS is not overdamped exclugin a direct coupling of its reservoir to the qubit.
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Throughout most of the parameter ranges presented in Figure 7, t T > Γ thus the TLS is not overdamped exclugin a direct coupling of its reservoir to the qubit.
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Higher order contributions to β in the multipole expansion may have an opposite sign to that of the leading term. Typically, their magnitude will be comparable at shorter distances (R≲25nm ), where the expansion converges slowly and yet higher order contributions are needed for an accurate estimate of the coupling.
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Higher order contributions to β in the multipole expansion may have an opposite sign to that of the leading term. Typically, their magnitude will be comparable at shorter distances (R ≲ 25 nm), where the expansion converges slowly and yet higher order contributions are needed for an accurate estimate of the coupling.
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The geometry depicted in Fig. yields β/γ∼1 and thus yields considerably larger gate errors and dephsing as compared with the parallel-axis geometry.
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The geometry depicted in Fig. yields β / γ ∼ 1 and thus yields considerably larger gate errors and dephsing as compared with the parallel-axis geometry.
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In refering to the double dot bias we adopt the convention of zero bias at the anticrossing point.
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In refering to the double dot bias we adopt the convention of zero bias at the anticrossing point.
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Notice that while the qubit holds two electrons, its charge density corresponds to single-particle operators. The two-particle qubit states are considered at a later stage, when evaluating the Coulomb matrix elements, Eq. .
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Notice that while the qubit holds two electrons, its charge density corresponds to single-particle operators. The two-particle qubit states are considered at a later stage, when evaluating the Coulomb matrix elements, Eq.
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