Gate-Tunable Spin-Orbit Coupling in a Germanium Hole Double Quantum Dot
- URL: http://arxiv.org/abs/2206.03653v1
- Date: Wed, 8 Jun 2022 02:44:31 GMT
- Title: Gate-Tunable Spin-Orbit Coupling in a Germanium Hole Double Quantum Dot
- Authors: He Liu, Ting Zhang, Ke Wang, Fei Gao, Gang Xu, Xin Zhang, Shu-Xiao Li,
Gang Cao, Ting Wang, Jianjun Zhang, Xuedong Hu, Hai-Ou Li and Guo-Ping Guo
- Abstract summary: Hole spins confined in semiconductor quantum dot systems have gained considerable interest for their strong spin-orbit interactions (SOIs)
Here we experimentally demonstrate a tunable SOI in a double quantum dot in a Germanium (Ge) hut wire (HW)
This tunability of the SOI could pave the way toward the realization of high-fidelity qubits in Ge HW systems.
- Score: 19.029069649697824
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Hole spins confined in semiconductor quantum dot systems have gained
considerable interest for their strong spin-orbit interactions (SOIs) and
relatively weak hyperfine interactions. Here we experimentally demonstrate a
tunable SOI in a double quantum dot in a Germanium (Ge) hut wire (HW), which
could help enable fast all-electric spin manipulations while suppressing
unwanted decoherence. Specifically, we measure the transport spectra in the
Pauli spin blockade regime in the double quantum dot device.By adjusting the
interdot tunnel coupling, we obtain an electric field tuned spin-orbit length
lso = 2.0 - 48.9 nm. This tunability of the SOI could pave the way toward the
realization of high-fidelity qubits in Ge HW systems.
Related papers
- 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) - Measurement of enhanced spin-orbit coupling strength for donor-bound electron spins in silicon [0.0]
We show that the strength of the spin-orbit coupling can be locally enhanced by more than two orders of magnitude in the manybody wave functions of multi-donor quantum dots compared to a single donor.
Our findings may provide a pathway towards all-electrical control of donor-bound spins in silicon using electric dipole spin resonance (EDSR)
arXiv Detail & Related papers (2024-04-24T09:34:56Z) - Strongly Coupled Spins of Silicon-Vacancy Centers Inside a Nanodiamond
with Sub-Megahertz Linewidth [43.06643088952006]
electron spin of a color center in diamond mediates interaction between a long-lived nuclear spin and a photon.
We demonstrate strong coupling of its electron spin, while the electron spin's decoherence rate remained below 1 MHz.
We furthermore demonstrate multi-spin coupling with the potential to establish registers of quantum memories in nanodiamonds.
arXiv Detail & Related papers (2023-12-14T14:17:35Z) - Control of an environmental spin defect beyond the coherence limit of a central spin [79.16635054977068]
We present a scalable approach to increase the size of electronic-spin registers.
We experimentally realize this approach to demonstrate the detection and coherent control of an unknown electronic spin outside the coherence limit of a central NV.
Our work paves the way for engineering larger quantum spin registers with the potential to advance nanoscale sensing, enable correlated noise spectroscopy for error correction, and facilitate the realization of spin-chain quantum wires for quantum communication.
arXiv Detail & Related papers (2023-06-29T17:55:16Z) - Coupled superconducting spin qubits with spin-orbit interaction [0.0]
Superconducting spin qubits, also known as Andreev spin qubits, promise to combine the benefits of superconducting qubits and spin qubits defined in quantum dots.
We show that superconducting spin qubits can be coupled to each other via the superconductor to implement two-qubit quantum gates.
We propose a scalable network of superconducting spin qubits which is suitable for implementing the surface code.
arXiv Detail & Related papers (2022-05-08T12:04:37Z) - Non-reciprocal Pauli Spin Blockade in a Silicon Double Quantum Dot [2.1244966990202903]
We present an experimental observation of a new, highly prevalent PSB-lifting mechanism in a silicon double quantum dot.
We find the mechanism to be energy-level selective and non-reciprocal for neighbouring charge configurations.
arXiv Detail & Related papers (2021-10-19T10:54:27Z) - Chemical tuning of spin clock transitions in molecular monomers based on
nuclear spin-free Ni(II) [52.259804540075514]
We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes.
The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments.
The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
arXiv Detail & Related papers (2021-03-04T13:31:40Z) - A natural heavy-hole flopping mode qubit in germanium [0.0]
Flopping mode qubits in double quantum dots (DQDs) allow for coherent spin-photon hybridization and fast qubit gates.
electronic systems rely on synthetic spin-orbit interaction (SOI) by means of a magnetic field gradient as a coupling mechanism.
We show that this challenging experimental setup can be avoided in heavy-hole (HH) systems in germanium (Ge) by utilizing the sizeable cubic Rashba SOI.
arXiv Detail & Related papers (2020-12-18T13:17:52Z) - Conditional quantum operation of two exchange-coupled single-donor spin
qubits in a MOS-compatible silicon device [48.7576911714538]
Silicon nanoelectronic devices can host single-qubit quantum logic operations with fidelity better than 99.9%.
For the spins of an electron bound to a single donor atom, introduced in the silicon by ion implantation, the quantum information can be stored for nearly 1 second.
Here we demonstrate the conditional, coherent control of an electron spin qubit in an exchange-coupled pair of $31$P donors implanted in silicon.
arXiv Detail & Related papers (2020-06-08T11:25:16Z) - Entanglement generation via power-of-SWAP operations between dynamic
electron-spin qubits [62.997667081978825]
Surface acoustic waves (SAWs) can create moving quantum dots in piezoelectric materials.
We show how electron-spin qubits located on dynamic quantum dots can be entangled.
arXiv Detail & Related papers (2020-01-15T19:00:01Z) - Hole spin in tunable Ge hut wire double quantum dot [18.480053435503994]
We report transport experiments in a tunable Ge hut wire hole double quantum dot.
We observe the signatures of Pauli spin blockade (PSB) with a large singlet-triplet energy splitting of 1.1 meV and extract the g factor.
arXiv Detail & Related papers (2020-01-14T14:57:17Z)
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.