Spin shuttling in a silicon double quantum dot

• URL: http://arxiv.org/abs/2007.03598v1
• Date: Tue, 7 Jul 2020 16:33:06 GMT
• Title: Spin shuttling in a silicon double quantum dot
• Authors: Florian Ginzel, Adam R. Mills, Jason R. Petta, Guido Burkard
• Abstract summary: We study a minimal version of spin shuttling between two quantum dots. Spin-orbit interaction and the Zeeman effect in an inhomogeneous magnetic field play an important role for spin shuttling. We find that a spin infidelity as low as $1-F_slesssim 0.002$ with a relatively fast level velocity of $alpha = 600, mu$eV/ns is feasible.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The transport of quantum information between different nodes of a quantum device is among the challenging functionalities of a quantum processor. In the context of spin qubits, this requirement can be met by coherent electron spin shuttling between semiconductor quantum dots. Here we theoretically study a minimal version of spin shuttling between two quantum dots. To this end, we analyze the dynamics of an electron during a detuning sweep in a silicon double quantum dot (DQD) occupied by one electron. Possibilities and limitations of spin transport are investigated. Spin-orbit interaction and the Zeeman effect in an inhomogeneous magnetic field play an important role for spin shuttling and are included in our model. Interactions that couple the position, spin and valley degrees of freedom open a number of avoided crossings in the spectrum allowing for diabatic transitions and interfering paths. The outcomes of single and repeated spin shuttling protocols are explored by means of numerical simulations and an approximate analytical model based on the solution of the Landau--Zener problem. We find that a spin infidelity as low as $1-F_s\lesssim 0.002$ with a relatively fast level velocity of $\alpha = 600\, {\mu}$eV/ns is feasible for optimal choices of parameters or by making use of constructive interference.

Related papers

• High-fidelity single-spin shuttling in silicon [0.0]
  We report shuttling of an electron inside an isotopically purified Si/SiGe heterostructure using electric gate potentials. It allows us to displace an electron over an effective distance of 10 mum in under 200 ns with an average fidelity of 99%. Results will guide future efforts to realize large-scale semiconductor quantum processors.
  arXiv  Detail & Related papers  (2024-06-11T13:51:52Z)
• Finite Pulse-Time Effects in Long-Baseline Quantum Clock Interferometry [45.73541813564926]
  We study the interplay of the quantum center-of-mass $-$ that can become delocalized $-$ together with the internal clock transitions. We show at the example of a Gaussian laser beam that the proposed quantum-clock interferometers are stable against perturbations from varying optical fields.
  arXiv  Detail & Related papers  (2023-09-25T18:00:03Z)
• Thermal masses and trapped-ion quantum spin models: a self-consistent approach to Yukawa-type interactions in the $λ\!φ^4$ model [44.99833362998488]
  A quantum simulation of magnetism in trapped-ion systems makes use of the crystal vibrations to mediate pairwise interactions between spins. These interactions can be accounted for by a long-wavelength relativistic theory, where the phonons are described by a coarse-grained Klein-Gordon field. We show that thermal effects, which can be controlled by laser cooling, can unveil this flow through the appearance of thermal masses in interacting QFTs.
  arXiv  Detail & Related papers  (2023-05-10T12:59:07Z)
• Bound state of distant photons in waveguide quantum electrodynamics [137.6408511310322]
  Quantum correlations between distant particles remain enigmatic since the birth of quantum mechanics. We predict a novel kind of bound quantum state in the simplest one-dimensional setup of two interacting particles in a box. Such states could be realized in the waveguide quantum electrodynamics platform.
  arXiv  Detail & Related papers  (2023-03-17T09:27:02Z)
• Quantum emulation of the transient dynamics in the multistate Landau-Zener model [50.591267188664666]
  We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity. Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
  arXiv  Detail & Related papers  (2022-11-26T15:04:11Z)
• 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)
• Coherent spin-valley oscillations in silicon [0.0]
  We show that the spin-valley coupling in Si enables coherent control of electron spins in Si. We demonstrate coherent manipulation of effective single- and two-electron spin states in a Si/SiGe double quantum dot without ac magnetic or electric fields.
  arXiv  Detail & Related papers  (2021-11-29T18:57:24Z)
• Quantum control of nuclear spin qubits in a rapidly rotating diamond [62.997667081978825]
  Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. We demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at $1,$kHz, faster than the nuclear spin coherence time. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.
  arXiv  Detail & Related papers  (2021-07-27T03:39:36Z)
• Long-Distance Superexchange between Semiconductor Quantum-Dot Electron Spins [0.0]
  We show evidence for long-distance spin-chain-mediated superexchange between electron spin qubits in semiconductor quantum dots. Superexchange is a promising technique to create long-distance coupling between quantum-dot spin qubits.
  arXiv  Detail & Related papers  (2020-09-13T19:50:59Z)
• Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain [0.0]
  We present evidence of adiabatic quantum-state transfer in semiconductor quantum-dot electron spins. Based on simulations, we estimate that the probability to correctly transfer single-spin eigenstates and two-spin singlet states can exceed 0.95.
  arXiv  Detail & Related papers  (2020-07-08T03:01:27Z)
• 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)

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.