Dephasing Of Spins - SLOTWOOD.NETLIFY.APP

Dephasing of charge and spin in semiconductor quantum dots.
Coherent Spin Precession and Lifetime-Limited Spin Dephasing.
Dephasing of Electron Spin Qubits due to their Interaction with Nuclei.
Semiclassical Model for the Dephasing of a Two-Electron Spin Qubit.
PDF Dephasing of Exchange-coupled Spins in Quantum Dots for Quantum.
[PDF] Dephasing mechanisms of diamond-based nuclear-spin memories for.
Pure dephasing of single Mn spin in semiconductor quantum dots.
PDF Nonperturbative Master Equation Solution of Central Spin Dephasing Dynamics.
Dephasing of transverse spin current in ferrimagnetic alloys.
(PDF) Hole spin dephasing time associated to hyperfine in teraction in.
Dephasing, decoherence, - UC Santa Barbara.
PDF Spin Echo.
A novel mechanism for spin dephasing due to spin-conserving scatterings.

Dephasing of charge and spin in semiconductor quantum dots.

. The spin dephasing time T2 of electrons in a very dirty metal is calculated. The dephasing is due to weak scattering processes which do not conserve the total electron spin. Two scattering processes which are of particular importance in the impurity band of many-valley semiconductors are considered: nuclear spin flip and intervalley spin orbit.

Coherent Spin Precession and Lifetime-Limited Spin Dephasing.

Nov 15, 2019 · The coherent spin dynamics of resident electrons and holes in an isotopically purified ZnSe/(Zn,Mg)Se single quantum well is investigated in different regimes, requiring corresponding adaption of the applied time-resolved pump-probe Kerr rotation technique. The purification of the Zn and Se atom species in the crystal to the isotopes with zero nuclear spin is expected to lead to an extension..

Dephasing of Electron Spin Qubits due to their Interaction with Nuclei.

Nov 17, 2015 · For the nuclear spin dephasing time T 2 in figure 3(a), away from the ground state and excited level anticrossing of the NV center (indicated by arrows in figure 3(a)), our analytical formulas agree well with the exact numerical results, whether or not the electron spin flip terms in are included. This indicates that the contribution involving. Dephasing of Si singlet-triplet qubits due to charge and spin defects Dimitrie Culcer1,2 and Neil M. Zimmerman3 1ICQD, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China 2School of Physics, The University of New South Wales, Sydney 2052, Australia 3National Institute of Standards and Technology.

Semiclassical Model for the Dephasing of a Two-Electron Spin Qubit.

Verse spin-dephasing times, T2*. 25−28 Thus, the combination of promising spin and optical properties could make perovskite nanocrystals attractive for future quantum technologies. Despite its importance, spin dephasing in lead-halide perovskites has only been investigated in bulk samples,7,8 and these do not show the long optical coherence. Jan 09, 2005 · Single-hole spin dephasing in bulk crystals. Decoherence of the hole angular momentum in bulk crystals is described within the framework of non-Markovian stochastic theory. We present the analytical result for the rate of this process. The derivation is based on the new formulation of the multiband Luttinger-Kohn Hamiltonian that reflects the.

PDF Dephasing of Exchange-coupled Spins in Quantum Dots for Quantum.

Sep 11, 2018 · Understanding the spin dephasing mechanism is of fundamental importance in all potential applications of the spin qubit. Here we demonstrate a spin dephasing mechanism in a semiconductor quantum dot due to the 1/f charge noise. The spin-charge interaction is mediated by the interplay between the spin–orbit coupling and the asymmetrical. That the dephasing length is about 4-5 times longer in nearly compensated CoGd than in ferromagnetic metals. This finding suggests that antiferromagnetic order can mitigate spin dephasing - in a manner analogous to spin echo rephasing for nuclear and qubit spin systems - even in structurally disordered alloys at room temperature. We also find. Mar 14, 2022 · Solid-state spins provide promising quantum bits for quantum science and technology. A central challenge is to protect these qubits from dephasing, a loss of quantum information due to undesired interactions with the environment. Over the past decades, many methods have been developed to actively mitigate dephasing.

[PDF] Dephasing mechanisms of diamond-based nuclear-spin memories for.

In this model, the dephasing rate is given by γ ZPL = γ B + γ 0 + γ th + γ U, where γ B is the radiatively limited dephasing of the lowest bright state, γ 0 and γ th are the spin-flip relaxation into the lowest dark state via spontaneous and stimulated phonon emission, respectively, and γ U accounts for excitation into a higher state.

Pure dephasing of single Mn spin in semiconductor quantum dots.

The understanding of spin dephasing may provide insights into the realization of high-fidelity quantum gates for spin-based quantum computing. A spin qubit in semiconductor quantum dots holds promise for quantum information processing for scalability and long coherence time. An important semiconductor qubit system is a double quantum dot.

PDF Nonperturbative Master Equation Solution of Central Spin Dephasing Dynamics.

Request PDF | Long dephasing time of NV center spins in diamond layers formed by hot ion implantation and high pressure high temperature annealing | Thin nitrogen doped layers with ~1 ppm NV. Here, in the present work, we extend our investigation to the barrier-thickness dependence of spin dephasing and dynamics in QWs. We apply magnetic field in the Voigt configuration. We study on a number of QWs and show that the dynamics of the optically oriented spins could be managed by controlling the well thickness of semiconductor QWs. A discrete time crystal (DTC) is a quantum phase of matter related to the symmetries of a periodically driven system. It can appear when the initial state breaks these symmetries, and hence the observation of DTCs is intimately related to the symmetry of the initial state. In this paper, we investigate a nontrivial situation in which two interacting regions are simultaneously prepared in two.

Dephasing of transverse spin current in ferrimagnetic alloys.

We study electron-phonon interaction induced decoherence between two-electron singlet and triplet states in a semiconductor double quantum dot using a spin-boson model. We investigate the onset and time evolution of this dephasing, and study its dependence on quantum dot parameters such as dot size and double dot separations, as well as the host materials (GaAs and Si). We find that electron. As observed in Figure 5 for pure hh in zero magnetic field, the spin z-component is constant, R1z (t ) = 1 , while an in-plane magnetic field induces dephasing and reduces the mean value of R1z (t ) which shows an oscillatory pattern. For R1x (t), a high field is then necessary to reach a steady-state regime where R1x (t) becomes close to 1. A semiconductor spin qubit is promising for quantum computing because of the long spin coherence time and the compatibility with the technological standards in the semiconductor industry [1, 2, 3.

(PDF) Hole spin dephasing time associated to hyperfine in teraction in.

We describe an efficient numerical method for simulating the dynamics of interacting spin ensembles in the presence of dephasing and decay. The method builds on the discrete truncated Wigner approximation for isolated systems, which combines the mean-field dynamics of a spin ensemble with a Monte Carlo sampling of discrete initial spin values to account for quantum correlations.

Dephasing, decoherence, - UC Santa Barbara.

The U.S. Department of Energy's Office of Scientific and Technical Information.

PDF Spin Echo.

Relaxation dephasing and quantum control of electron spins in double quantum dots 2007. by Xiangji Cai. Date added: 11/08/15. Quantum Physics. Download Free PDF. Download PDF Package PDF Pack. Download. PDF Pack. ABOUT THE AUTHOR. Xiangji Cai. Independent Researcher. 1.

A novel mechanism for spin dephasing due to spin-conserving scatterings.

With the dephasing being notably faster than in undoped II-VI semiconductors, the magnetic dopants must play a key role, modifying the known dephasing mechanisms and introducing new ones. Focusing on the latter, we theoretically explore the spin dephasing channel arising from magnetization fluctuations sampled by the itinerant excitons.