TY - JOUR
T1 - Hyperfine switching triggered by resonant tunneling for the detection of a single nuclear spin qubit
AU - Tada, Tomofumi
N1 - Funding Information:
The present work was supported in part through the Grant-in-Aid for Scientific Research on Priority Area, “Nanoionics (439)” (19017004) by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.
PY - 2008/10/27
Y1 - 2008/10/27
N2 - A novel detection mechanism and a robust control of a single nuclear spin-flip by hyperfine interactions between the nuclear spin and tunneling electron spin are proposed on the basis of ab initio non-equilibrium Green's function calculations. The calculated relaxation times of the nuclear spin of proton in a nano-contact system, Pd(electrode)-H2-Pd(electrode), show that ON/OFF switching of hyperfine interactions is effectively triggered by resonant tunneling mediated through the d-orbitals of Pd. The relaxation times at ON-resonance are ∼ 103 times faster than those at OFF-resonance, indicating that ON-resonance is suitable for the detection (read-out) of nuclear spin states. In addition, the effectiveness of bias voltage applications at OFF-resonance for selective operations on the proton qubit is demonstrated in the calculations of the resonant frequencies of proton using the gauge-invariant atomic orbital method.
AB - A novel detection mechanism and a robust control of a single nuclear spin-flip by hyperfine interactions between the nuclear spin and tunneling electron spin are proposed on the basis of ab initio non-equilibrium Green's function calculations. The calculated relaxation times of the nuclear spin of proton in a nano-contact system, Pd(electrode)-H2-Pd(electrode), show that ON/OFF switching of hyperfine interactions is effectively triggered by resonant tunneling mediated through the d-orbitals of Pd. The relaxation times at ON-resonance are ∼ 103 times faster than those at OFF-resonance, indicating that ON-resonance is suitable for the detection (read-out) of nuclear spin states. In addition, the effectiveness of bias voltage applications at OFF-resonance for selective operations on the proton qubit is demonstrated in the calculations of the resonant frequencies of proton using the gauge-invariant atomic orbital method.
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U2 - 10.1016/j.physleta.2008.09.020
DO - 10.1016/j.physleta.2008.09.020
M3 - Article
AN - SCOPUS:53149098900
SN - 0375-9601
VL - 372
SP - 6690
EP - 6693
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 44
ER -