Dynamic 
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 nuclear spin polarization in nitrogen-vacancy centers in diamond

Busaite, Laima; Lazda, Reinis; Bērziņš, A.; Auzinsh, M.; Ferber, R.; Gahbauer, F.

doi:10.1103/physrevb.102.224101

Cited by 24 publications

(9 citation statements)

References 46 publications

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“…In particular the effective hyperfine coupling in the |3, Γ 4 , σ KD is the most similar to the simple diagonal dipolar coupling to the nuclear spin, because the crystal potential does not mix the orbital singlet (m = 0) state with the remaining orbital states and the spin-orbit coupling vanishes in first order in the orbital singlet. Additionally, the form of the symmetry allowed part of the anisotropic hyperfine tensor in this case also agrees with that of the 14 N NV − -center which has the same symmetry but comprises spins S = I = 1 [8,12,15].…”

supporting

confidence: 72%

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Hyperfine Structure of Transition Metal Defects in SiC

Tissot,

Burkard

2021

Preprint

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Transition metal (TM) defects in silicon carbide (SiC) are a promising platform in quantum technology, especially because some TM defects emit in the telecom band. We develop a theory for the interaction of an active electron in the D-shell of a TM defect in SiC with the TM nuclear spin and derive the effective hyperfine tensor within the Kramers doublets formed by the spin-orbit coupling. Based on our theory we discuss the possibility to exchange the nuclear and electron states with potential applications for nuclear spin manipulation and long-lived nunclear-spin based quantum memories.

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supporting

confidence: 72%

“…In these systems one can benefit from short gate times of one quantum system as well as long coherence times of the other. A much studied system of this type is the nitrogen vacancy center in diamond with its neighboring nuclear spins [8][9][10][11][12][13][14][15][16] (and Refs. [17,18] for reviews).…”

mentioning

confidence: 99%

Hyperfine Structure of Transition Metal Defects in SiC

Tissot,

Burkard

2021

Preprint

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“…The nuclear spin polarization process is slower, typically taking up to five or more microseconds to complete [31]. The degree of polarization also depends on the magnetic field strength [42]. In our experiments, the temporal dependence of optical pumping is convolved with the angular variation of the magnetic field alignment imposed by rotation, and therefore the nuclear spin polarization efficiency is also affected by rotation.…”

Section: Optical Polarizationmentioning

confidence: 99%

Quantum control of nuclear spin qubits in a rapidly rotating diamond

Wood¹,

Goldblatt²,

Scholten³

et al. 2021

Preprint

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Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. When coupled to the spin of an optically-active electron, nuclear spins can be rapidly polarized, controlled and read via lasers and radiofrequency fields. Possessing coherence times of several milliseconds at room temperature, nuclear spins hosted by a nitrogen-vacancy center in diamond are thus intriguing systems to observe how classical physical rotation at quantum timescales affects a quantum system. Unlocking this potential is hampered by precise and inflexible constraints on magnetic field strength and alignment in order to optically induce nuclear polarization, which restricts the scope for further study and applications. In this work, 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. Free from the need to maintain strict field alignment, we are able to measure and control nuclear spins in hitherto inaccessible regimes, such as in the presence of a large, time-varying magnetic field that makes an angle of more than 100 • to the nitrogen-lattice vacancy axis. The field induces spin mixing between the electron and nuclear states of the qubits, decoupling them from oscillating rf fields. We are able to demonstrate that coherent spin state control is possible at any point of the rotation, and even for up to six rotation periods. We combine continuous dynamical decoupling with quantum feedforward control to eliminate decoherence induced by imperfect mechanical rotation. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.

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“…where D(T ) ≈ 2.87 GHz is the temperaturedependent [28] zero-field splitting at room temperature, M z is the effective electric field component associated with mechanical stress, and γ N V = 28 GHz/T is the NV gyromagnetic ratio. In general, there are four other components M x , M e , N x , N y associated with mechanical stresses, which are significant only at B ≈ 0 [19,29,30] or in the vicinities (51.2 and 102.4 mT) of levels anticrossing [31][32][33]. Yellow spheres depict carbon atoms, a blue sphere -substitutional nitrogen, and a black sphere -a lattice vacancy.…”

Section: A Detection Principlementioning

confidence: 99%

NV microscopy of thermally controlled stresses caused by Cr$_2$O$_3$ thin films

Bērziņš¹,

Šmits²,

Petruhins³

et al. 2021

Preprint

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Many modern applications, including quantum computing and quantum sensing, use substratefilm interfaces. Particularly, thin films of chromium or titanium and their oxides are commonly used to bind various structures, such as resonators, masks, or microwave antennas, to a diamond surface. Due to different thermal expansions of involved materials, such films and structures could produce significant stresses, which need to be measured or predicted. In this paper, we demonstrate imaging of stresses in the top layer of diamond with deposited structures of Cr2O3 at temperatures 19 • C and 37 • C by using stress-sensitive optically detected magnetic resonances (ODMR) in NV centers. We also calculated stresses in the diamond-film interface by using finite-element analysis and correlated them to measured ODMR frequency shifts. As predicted by the simulation, the measured high-contrast frequency-shift patterns are only due to thermal stresses, whose spin-stress coupling constant along the NV axis is 21±1 MHz/GPa that is in agreement with constants previously obtained from single NV centers in diamond cantilever. Our widefield imaging demonstrates the NV microscopy as a convenient platform that could optically detect and quantify spatial distributions of stresses in diamond-based photonic devices with a micrometer precision. Our results also show that thin film structures produce significant stresses in them, that should be accounted for in NV-based applications.

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Dynamic N14 nuclear spin polarization in nitrogen-vacancy centers in diamond

Cited by 24 publications

References 46 publications

Hyperfine Structure of Transition Metal Defects in SiC

Hyperfine Structure of Transition Metal Defects in SiC

Quantum control of nuclear spin qubits in a rapidly rotating diamond

NV microscopy of thermally controlled stresses caused by Cr$_2$O$_3$ thin films

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