Dephasing Of Spins - NEWYORKLOTO.NETLIFY.APP

Suppressing Spin Qubit Dephasing by Nuclear State Preparation.
Decoherence of Transverse Electronic Spin Current in Magnetic Metals.
Entanglement of Spin-Pair Qubits with Intrinsic Dephasing Times.
Coherent Spin Precession and Lifetime-Limited Spin Dephasing.
Entanglement of Spin-Pair Qubits with Intrinsic Dephasing.
Dephasing of transverse spin current in ferrimagnetic alloys.
Theory of nuclear spin dephasing and relaxation by optically.
Dephasing of Si spin qubits due to charge noise – arXiv Vanity.
MRI - Dephasing - MR-TIP: Database.
Dephasing - Wikipedia.
Relaxation, dephasing, and quantum control of electron spins in.
Harnessing many-body spin environment for long coherence storage and.
Dephasing of Exchange‐Coupled Spins in Quantum Dots for.
Optical observation of single spins in silicon | Nature.

Suppressing Spin Qubit Dephasing by Nuclear State Preparation.

Jan 26, 2021 · 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 antiparallel magnetic moments of Co and Gd sublattices partially cancel out the dephasing of a transverse spin current, thereby resulting in a long spin dephasing length of ≈ 5-6 nm near the magnetic compensation point. We find evidence that the spin current interacts somewhat more strongly with the itinerant transition-metal Co magnetism. Mar 24, 2006 · 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.

Decoherence of Transverse Electronic Spin Current in Magnetic Metals.

Entanglement of Spin-Pair Qubits with Intrinsic Dephasing Times.

Jul 25, 2018 · Quantum spin dephasing is caused by inhomogeneous coupling to the environment, with resulting limits to the measurement time and precision of spin-based sensors. The effects of spin dephasing can be especially pernicious for dense ensembles of electronic spins in the solid state, such as nitrogen-vacancy (NV) color centers in diamond.

Coherent Spin Precession and Lifetime-Limited Spin Dephasing.

. 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.

Entanglement of Spin-Pair Qubits with Intrinsic Dephasing.

Dec 09, 2015 · 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. 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.

Dephasing of transverse spin current in ferrimagnetic alloys.

Single spins without optical access have been detected electrically in silicon 23,24,25,26,27,28,29,30, single spins have been driven optically and detected electrically 31, and single centres. 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..

Theory of nuclear spin dephasing and relaxation by optically.

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. 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.

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

T2* perfusion uses dynamic sequences based on multi or single shot techniques. The T2* ( T2) MRI signal drop within or across a brain region is caused by spin dephasing during the rapid passage of contrast agent through the capillary bed. The signal decrease is used to compute the relative perfusion to that region.. Sep 12, 2021 · 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.

MRI - Dephasing - MR-TIP: Database.

Dephasing - Wikipedia.

This solvent dependence of 1/Tm is similar to that observed for nitroxyl radicals, which indicates that the effect of solvent methyl groups on spin-echo dephasing at low temperature is quite general. At higher temperatures the echo dephasing is dominated by spin-lattice relaxation and is concentration dependent. In this article, we report progress on spin dephasing of two exchange-coupled spins in a double quantum dot. We first discuss the schemes of two-qubit gates and qubit encodings in gate-defined quantum dots or donor atoms based on the exchange interaction. Then, we report the progress on spin dephasing of a singlet-triplet qubit or a two-qubit gate.

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

Here we present a detailed theory for electron-spin dynamics in two-electron double-dot systems that was used to guide those experiments and analyze the results. Specifically, we analyze both spin- and charge-relaxation and dephasing mechanisms that are relevant to experiments and discuss practical approaches for quantum control of two-electron.. 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.

Harnessing many-body spin environment for long coherence storage and.

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.

Dephasing of Exchange‐Coupled Spins in Quantum Dots for.

Optical observation of single spins in silicon | Nature.

Moving from the visit limited regime to the static dephasing regime, a crossover between a purely discrete process and a purely continuous process occurs. Developing a simple model of the dephasing process, the average dephasing time is demonstrated to be relatively constant thus giving insight into the long lasting plateau in the relaxation rate.