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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Coherently controlling robust spin-orbit qubits of electrons in nanowire quantum dots
(Submitted on 13 Apr 2024 (v1), last revised 20 Apr 2024 (this version, v2))
Abstract: We consider an electron confined in a gated nanowire quantum dot (NQD) with arbitrarily strong spin-orbit coupling (SOC) and weak static magnetic field, and treat the latter as a perturbation to seek the maximal spin-motion entangled states with the exact general solutions of the perturbed equations. From the boundedness and self-consistent conditions of the general solutions we find two corrected energies to any n level of the unperturbed system with ground state n = 0, which are much less than the unperturbed level-difference and corresponds to a spin-orbit qubit. We demonstrate the metastability of the two-level states and the decoherence-averse effect of SOC, and suggest an alternative scheme to perform the qubit control, simply by adjusting the orientation of magnetic field for any fixed SOC. Such a adjustment can lead to the spin flipping of the state vector and the position exchanging of the probability-density wavepackets which can be proposed as the non-Abelian quasiparticles. The results could be directly extended to a weakly coupled array of NQDs for coherently encoding the robust spin-orbit qubits.
Submission history
From: Kuo Hai [view email][v1] Sat, 13 Apr 2024 23:41:04 GMT (2329kb,D)
[v2] Sat, 20 Apr 2024 04:50:52 GMT (2330kb,D)
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