Recent advances in hole-spin qubits

• URL: http://arxiv.org/abs/2210.13725v1
• Date: Tue, 25 Oct 2022 02:43:44 GMT
• Title: Recent advances in hole-spin qubits
• Abstract summary: In recent years, hole-spin qubits based on semiconductor quantum dots have advanced at a rapid pace. We first review the main potential advantages of these hole-spin qubits with respect to their electron-spin counterparts, and give a general theoretical framework describing them. In the second part of the article we provide a survey of experimental realizations, which spans a relatively broad spectrum of devices based on GaAs, Si, or Si/Ge heterostructures.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In recent years, hole-spin qubits based on semiconductor quantum dots have advanced at a rapid pace. We first review the main potential advantages of these hole-spin qubits with respect to their electron-spin counterparts, and give a general theoretical framework describing them. The basic features of spin-orbit coupling and hyperfine interaction in the valence band are discussed, together with consequences on coherence and spin manipulation. In the second part of the article we provide a survey of experimental realizations, which spans a relatively broad spectrum of devices based on GaAs, Si, or Si/Ge heterostructures. We conclude with a brief outlook.

Related papers

• Quantum geometrical description of hole spin qubits far away from the $Γ$-point [0.0]
  Hole spin qubits provide one of the leading platforms for spin-based quantum computing.<n>Here, we study the SOI created by the in-plane confinement by deriving non-perturbative effective Hamiltonians numerically for hole spin qubits.<n>We find that the quantum geometry of the 2DHG naturally emerges, leading to a meaningful non-perturbative definition of pseudospin valid far away from the $$-point.
  arXiv  Detail & Related papers  (2026-06-12T17:47:35Z)
• Tailoring pure valley-Zeeman spin-orbit coupling in WSe$_2$-encapsulated monolayer graphene [42.39722022913058]
  Engineering proximity effects in twisted van der Waals heterostructures offers a powerful platform for designing electronic properties.<n>We report pure valley-Zeeman spin-orbit coupling in monolayer graphene, achieved by encapsulation between two parallel twisted WSe$$ monolayers.<n>We also demonstrate the ability to completely quench the proximity spin-orbit coupling by tuning the encapsulated geometry.
  arXiv  Detail & Related papers  (2026-06-02T07:43:48Z)
• Theory of spin qubits and the path to scalability [0.0]
  We first provide an introduction to the different qubit implementations currently being investigated, including single electron-spin qubits, hole-spin qubits, donor qubits, and multispin encodings.<n>We discuss how the confinement and strain present in semiconductor heterostructures produce addressable levels whose spin degree of freedom can be used to encode a qubit.<n>A large emphasis is placed on reviewing the theoretical foundations and recent experimental demonstrations of proposed mechanisms for long-range coupling, including hybrid approaches based on circuit QED and Andreev qubits, as well as spin shuttling.
  arXiv  Detail & Related papers  (2026-04-15T09:14:17Z)
• Hole-spin qubits in germanium beyond the single-particle regime [0.0]
  We investigate three-hole qubits in germanium and show that their performances compare well with those of their single-hole counterparts.<n>In particular, enhancements of the gating times by two orders of magnitude are obtained in slightly elongated quantum dots.
  arXiv  Detail & Related papers  (2025-05-05T08:23:15Z)
• First-Principles Framework for the Prediction of Intersystem Crossing Rates in Spin Defects: The Role of Electron Correlation [1.9408226857225095]
  We present a first-principles framework to investigate intersystem crossing processes, which represent crucial steps in the optical spin-polarization cycle. Considering the nitrogen-vacancy center in diamond as a case study, we demonstrate that our framework effectively captures electron correlation effects. We validate our predictions by carrying out measurements of fluorescence lifetimes, finding excellent agreement between theory and experiments.
  arXiv  Detail & Related papers  (2025-02-27T01:01:24Z)
• Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures [44.99833362998488]
  We propose a one-dimensional electronic nanodevice inspired in recently fabricated semiconductor-superconductor-ferromagnetic insulator hybrids. We show that the device can be tuned across spin- and fermion parity-changing QPTs by adjusting the FMI layer length orange and/or by applying a global backgate voltage. Our findings suggest that these effects are experimentally accessible and offer a robust platform for studying quantum phase transitions in hybrid nanowires.
  arXiv  Detail & Related papers  (2024-10-18T22:25:50Z)
• Gate-based spin readout of hole quantum dots with site-dependent $g-$factors [101.23523361398418]
  We experimentally investigate a hole double quantum dot in silicon by carrying out spin readout with gate-based reflectometry. We show that characteristic features in the reflected phase signal arising from magneto-spectroscopy convey information on site-dependent $g-$factors in the two dots.
  arXiv  Detail & Related papers  (2022-06-27T09:07:20Z)
• Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum dots [0.0]
  An anomalous energy splitting of spin triplet states at zero magnetic field has been measured in germanium quantum dots. This zero-field splitting could crucially alter the coupling between tunnel-coupled quantum dots. We develop an analytical model linking the zero-field splitting to spin-orbit interactions that are cubic in momentum.
  arXiv  Detail & Related papers  (2022-05-05T11:45:24Z)
• Quantum Dots / Spin Qubits [0.0]
  Spin qubits in semiconductor quantum dots represent a prominent family of solid-state qubits in the effort to build a quantum computer. The simplest spin qubit is a single electron spin located in a quantum dot. Spin qubits experience complex effects due to their semiconductor environment.
  arXiv  Detail & Related papers  (2022-04-08T19:21:19Z)
• Semiconductor Spin Qubits [0.0]
  Review focuses on the physics of semiconductor spin qubits. Includes the four major types of spin qubits: single spin qubits, donor spin qubits, singlet-triplet spin qubits, and exchange-only spin qubits.
  arXiv  Detail & Related papers  (2021-12-16T13:17:47Z)
• Genuine multipartite entanglement and quantum coherence in an electron-positron system: Relativistic covariance [117.44028458220427]
  We analyze the behavior of both genuine multipartite entanglement and quantum coherence under Lorentz boosts. A given combination of these quantum resources is shown to form a Lorentz invariant.
  arXiv  Detail & Related papers  (2021-11-26T17:22:59Z)
• Five-second coherence of a single spin with single-shot readout in silicon carbide [84.97423065534817]
  We demonstrate single-shot readout of single defects in silicon carbide (SiC) We achieve over 80% readout fidelity without pre- or post-selection. We report single spin T2 > 5s, over two orders of magnitude greater than previously reported in this system.
  arXiv  Detail & Related papers  (2021-10-04T17:35:02Z)
• Relativistic aspects of orbital and magnetic anisotropies in the chemical bonding and structure of lanthanide molecules [60.17174832243075]
  We study the electronic and ro-vibrational states of heavy homonuclear lanthanide Er2 and Tm2 molecules by applying state-of-the-art relativistic methods. We were able to obtain reliable spin-orbit and correlation-induced splittings between the 91 Er2 and 36 Tm2 electronic potentials dissociating to two ground-state atoms.
  arXiv  Detail & Related papers  (2021-07-06T15:34:00Z)
• Partitioning dysprosium's electronic spin to reveal entanglement in non-classical states [55.41644538483948]
  We report on an experimental study of entanglement in dysprosium's electronic spin. Our findings open up the possibility to engineer novel types of entangled atomic ensembles.
  arXiv  Detail & Related papers  (2021-04-29T15:02:22Z)
• Optical spin control and coherence properties of acceptor bound holes in strained GaAs [0.4721851604275367]
  Hole spins in semiconductors are a potential qubit alternative to electron spins. In nuclear-spin-rich host crystals like GaAs, the hyperfine interaction of hole spins with nuclei is considerably weaker than that for electrons. We demonstrate optical pumping and coherent population trapping for acceptor-bound holes in a strained GaAs epitaxial layer.
  arXiv  Detail & Related papers  (2020-12-13T22:04:17Z)
• A singlet triplet hole spin qubit in planar Ge [40.24757332810004]
  GroupIV hole spin qubits have moved into the focus of interest due to the ease of operation and compatibility with Si technology. We demonstrate a hole spin qubit operating at fields below 10 mT, the critical field of Al, by exploiting the large out-of-plane hole g-factors in planar Ge. Results demonstrate that Ge hole singlet-triplet qubits are competing with state-of-the art GaAs and Si singlet-triplet qubits.
  arXiv  Detail & Related papers  (2020-11-27T14:41:08Z)
• Strong spin-orbit interaction and $g$-factor renormalization of hole spins in Ge/Si nanowire quantum dots [0.0]
  Hole spins in Ge/Si core/shell nanowires experience a spin-orbit interaction that has been predicted to be both strong and electrically tunable. We experimentally determine the strength of spin-orbit interaction of hole spins confined to a double quantum dot in a Ge/Si nanowire.
  arXiv  Detail & Related papers  (2020-07-08T17:54:49Z)
• The limit of spin lifetime in solid-state electronic spins [77.34726150561087]
  We provide a complete first-principles picture of spin relaxation that includes up to two-phonon processes. We study a vanadium-based molecular qubit and reveal that the spin lifetime at high temperature is limited by Raman processes.
  arXiv  Detail & Related papers  (2020-04-08T14:27:36Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.