Dephasing Of Spins - DEPOSITABC.NETLIFY.APP

Dephasing of Si spin qubits due to charge noise - arXiv Vanity.
Dephasing of Exchange-coupled Spins in Quantum Dots for Quantum.
Relaxation, dephasing, and quantum control of electron spins in double.
Dephasing of spins - Wakelet.
Towards quantum networks of single spins: analysis of a.
Dephasing of Exchange‐Coupled Spins in Quantum Dots for Quantum.
Suppressing Spin Qubit Dephasing by Nuclear State Preparation.
Dephasing, decoherence, - UC Santa Barbara.
Relaxation, dephasing, and quantum control of electron spins.
Coherent Manipulation of Coupled Electron Spins in.
Dephasing of transverse spin current in ferrimagnetic alloys (Journal.
A spin dephasing mechanism mediated by the interplay between the spin.
Dephasing - an overview | ScienceDirect Topics.
Dephasing of spin echoes by multiple heteronuclear dipolar interactions.

Dephasing of Si spin qubits due to charge noise - arXiv Vanity.

Closed-form, numerical algorithms are presented for calculating REDOR dephasing for three general cases: (i) collections of isolated I-S spin pairs; (ii) many S spins coupled to an I spin; and (iii) an I-S spin pair in relative motion. For the case when more than one S spin is dipolar coupled to an. It has been predicted that transverse spin current can propagate coherently (without dephasing) over a long distance in antiferromagnetically ordered metals. Here, we estimate the dephasing length of transverse spin current in ferrimagnetic CoGd alloys by spin pumping measurements across the compensation point. A modified drift-diffusion model, which accounts for spin-current transmission.

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

In this article, progress on the spin dephasing of two exchange-coupled spins in a double quantum dot is reported. First, the schemes of two-qubit gates and qubit encodings in gate-defined quantum dots or donor atoms based on the exchange interaction are discussed. Then, the progress on spin dephasing of a singlet-triplet qubit or a two-qubit. Specifically, we analyze the relaxation and dephasing mechanisms that are relevant to experiments and discuss practical approaches for quantum control of two-electron system. We show that both charge and spin dephasing play important roles in the dynamics of the two-spin system, but neither represents a fundamental limit for electrical control. Cywinski, L., Witzel, W. M. & Das Sarma, S. Pure quantum dephasing of a solid-state electron spin qubit in a large nuclear spin bath coupled by long-range hyperfine mediated interactions. Phys. Rev.

Relaxation, dephasing, and quantum control of electron spins in double.

Spins in the samples were oriented optically by circularly polarized light pulses with photon energy just required for the heavy-hole (HH) excitation [].In the quantum well structures, owing to their quantum confinement, the degeneracy of the HH and light-hole (LH) valence bands is removed, and the excitation of only the HH band produces 100% spin polarization. It has been predicted that transverse spin current can propagate coherently (without dephasing) over a long distance in antiferromagnetically ordered metals. Here, we estimate the dephasing length of transverse spin current in ferrimagnetic CoGd alloys by spin pumping measurements across the compensation point. A modified drift-diffusion model, which accounts for spin-current transmission.

Dephasing of spins - Wakelet.

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.. Spin dephasing in quantum wires. Physical Review B, 2003. Marc Cahay. Download Download PDF. Full PDF Package Download Full PDF Package. This Paper. 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 quantum dot confining potential.

Towards quantum networks of single spins: analysis of a.

We measure singlet-triplet dephasing in a two-electron double quantum dot in the presence of an exchange interaction which can be electrically tuned from much smaller to much larger than the hyperfine energy. Saturation of dephasing and damped oscillations of the spin correlator as a function of tim. Spin qubits in Silicon quantum dots can have long coherence times, yet their manipulation relies on the exchange interaction, through which charge noise can induce decoherence. Charge traps near the interface of a Si heterostructure lead to fluctuations in the quantum-dot confinement and barrier potentials, which cause gating errors and two-spin dephasing. We quantify these effects in Si. We predict that spin dephasing depends on the electron-electron (e-e) interaction but differently from the charge dephasing due to distinct dominant tunneling excitations. In contrast, in a spinful Luttinger liquid with SU(2) invariance, uncharged spin excitations can carry spin current without dephasing in spite of the presence of e-e.

Dephasing of Exchange‐Coupled Spins in Quantum Dots for Quantum.

The U.S. Department of Energy's Office of Scientific and Technical Information. Dephasing. The spins (protons) go out of phase in the transverse plane when the Rf pulse is switched of. This dephasing is due to static magnetic field inhomogeneities intrinsic (i.e. susceptibility changes at tissue interfaces) and extrinsic (i.e. field inhomogeneities of the main magnetic field) to the examined object. See also T2*.

Suppressing Spin Qubit Dephasing by Nuclear State Preparation.

. Numerical REDOR simulations are presented for cases in which single observe spins S are dipolarly coupled to groups of spins I in distinct geometries and suggest a convenient method of obtaining site-resolved second moment information in disordered materials. The application of rotational echo double resonance (REDOR) nuclear magnetic resonance (NMR) for accurate distance measurements has thus. Download scientific diagram | Spatial dephasing of ensemble average spin vector in GaAs quantum wire at 30K for various driving electric fields. Spins are injected with their polarization.

Dephasing, decoherence, - UC Santa Barbara.

The spin interaction of a hole confined in a quantu m dot with the surrounding nuclei is described in terms of an effective magnetic field. We show that, in contrast to the Fermi contact hyperfine interaction for conduction electr ons, the... Hole spin dephasing time associated to hyperfine in teraction in quantum dots. 2000. B. Eble. C.

Relaxation, dephasing, and quantum control of electron spins.

We present a theoretical framework to describe the dephasing of the nuclear spins under repeated generation of NV spin-photon entanglement and show that quantum states can be stored during hundreds of repetitions using typical experimental coupling parameters. This dephasing with a true phase coherence time [12,14], T2 ¼ 348ð18Þ ns at room temperature. Upon cooling to 10 K, T2 increases to 611(44) ns, a mere factor of 2 difference from the room-temperature value. Loss of spin phase coherence due to recombination or dissociation of spins in the ensemble, or irreversible spin. 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.

Coherent Manipulation of Coupled Electron Spins in.

Of spin-wave dephasing has been reported recently [8]. That the interaction mechanism is dominated by dephasing, as opposed to Rydberg blockade, was inferred from the evolution of the excited fraction of Rydberg atoms as a function of the Rabi frequency and by the absence of many-body oscillations, typical of the blockade regime...

Dephasing of transverse spin current in ferrimagnetic alloys (Journal.

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

A spin dephasing mechanism mediated by the interplay between the spin.

Here, we estimate the dephasing length of transverse spin current in ferrimagnetic CoGd alloys by spin pumping measurements across the compensation point. A modified drift-diffusion model, which. The nuclear spins of the host lattice couple to electrons via the hyperfine interaction and causes rapid electron spin dephasing. In the GaAs devices presented here, for instance, an ensemble of initialized spin pairs will retain their phase relationship for T 2 * ∼ 15 ns, consistent with theoretical estimates (9–11) and previous measurements..

Dephasing - an overview | ScienceDirect Topics.

Download scientific diagram | Dephasing of transverse magnetization during a fast spin echo sequence for spins moving through a vessel with constant velocity (v). If the actual refocusing pulses..

Dephasing of spin echoes by multiple heteronuclear dipolar interactions.

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. Spin Coherence and Dephasing of Localized Electrons in Monolayer MoS₂ Nano Lett. doi: 10.1021/acs.nanolett.5b03771. Epub 2015 Nov 12. Authors Luyi Yang 1 , Weibing Chen 2 , Kathleen M McCreary 3 , Berend T Jonker 3 , Jun Lou 2 , Scott A Crooker 1 Affiliations 1 National High Magnetic Field Laboratory , Los Alamos, New Mexico 87545, United States. Dephasing of optically generated electron spins in the presence of the external magnetic field and electric bias in semiconductor nano-structures has been studied by time- and polarization-resolved spectrometry. The obtained experimental data are presented in depen.