Coherence-preserving cooling of nuclear spin qubits in a weak magnetic
field
- URL: http://arxiv.org/abs/2312.06332v1
- Date: Mon, 11 Dec 2023 12:30:29 GMT
- Title: Coherence-preserving cooling of nuclear spin qubits in a weak magnetic
field
- Authors: Xiao-Feng Shi
- Abstract summary: Nuclear spin memories of divalent neutral atoms can allow spin-preserving resolved-sideband cooling in a strong magnetic field.
We present a theory for cooling $87$Sr nuclear-spin qubits in a weak magnetic field.
- Score: 2.9929720732076226
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Nuclear spin memories of divalent neutral atoms can allow spin-preserving
resolved-sideband cooling in a strong magnetic field [Phys. Rev. Lett. 99,
123001 (2007)]. We present a theory for cooling $^{87}$Sr nuclear-spin qubits
in a weak magnetic field. The theory depends on laser excitation of
$5s5p~^1P_1$ to a nearby state which results in $m_J$-dependent AC Stark shifts
large compared to the hyperfine interaction. This effectively suppresses the
nuclear-spin mixing due to the hyperfine interaction. Sideband cooling via the
clock state quenched by the AC Stark-shifted $^1P_1$ state leads to
nuclear-spin-preserving spontaneous emission back to the ground state. More
than being compatible with low magnetic fields, the theory is applicable when
the nuclear spin qubits are defined by the two lowest Zeeman substates.
Related papers
- Spin-orbit torque on nuclear spins exerted by a spin accumulation via
hyperfine interactions [49.1574468325115]
This article demonstrates that the hyperfine coupling, which consists of Fermi contact and dipolar interactions, can mediate the application of spin-orbit torques acting on nuclear spins.
The reactions to the equilibrium and nonequilibrium components of the spin density is a torque on the nucleus with field-like and damping-like components.
This nuclear spin-orbit torque is a step toward stabilizing and controlling nuclear magnetic momenta, in magnitude and direction, and realizing nuclear spintronics.
arXiv Detail & Related papers (2023-05-21T08:05:23Z) - Nuclear spin relaxation in cold atom-molecule collisions [0.0]
We explore the quantum dynamics of nuclear spin relaxation in cold collisions of $1Sigma+$ molecules with structureless atoms in an external magnetic field.
We find that nuclear spin relaxation in the ground rotational manifold of CO occurs extremely slowly due to the absence of direct couplings between the nuclear spin sublevels.
For some initial states, we also observe a strong magnetic field dependence, which can be understood using the first Born approximation.
arXiv Detail & Related papers (2022-12-10T21:06:36Z) - Robust nuclear spin entanglement via dipolar interactions in polar
molecules [0.8315801422499862]
We propose a general protocol for on-demand generation of robust entangled states of $1Sigma$ and $2Sigma$ polar molecules.
By encoding a spin-1/2 degree of freedom in a combined set of spin and rotational molecular levels, we theoretically demonstrate the emergence of effective spin-spin interactions of the Ising and XXZ forms.
arXiv Detail & Related papers (2022-04-30T07:36:10Z) - 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) - Anisotropic electron-nuclear interactions in a rotating quantum spin
bath [55.41644538483948]
Spin-bath interactions are strongly anisotropic, and rapid physical rotation has long been used in solid-state nuclear magnetic resonance.
We show that the interaction between electron spins of nitrogen-vacancy centers and a bath of $13$C nuclear spins introduces decoherence into the system.
Our findings offer new insights into the use of physical rotation for quantum control with implications for quantum systems having motional and rotational degrees of freedom that are not fixed.
arXiv Detail & Related papers (2021-05-16T06:15:00Z) - Electrically tuned hyperfine spectrum in neutral
Tb(II)(Cp$^{\rm{iPr5}}$)$_2$ single-molecule magnet [64.10537606150362]
Both molecular electronic and nuclear spin levels can be used as qubits.
In solid state systems with dopants, an electric field was shown to effectively change the spacing between the nuclear spin qubit levels.
This hyperfine Stark effect may be useful for applications of molecular nuclear spins for quantum computing.
arXiv Detail & Related papers (2020-07-31T01:48:57Z) - Hyperfine and quadrupole interactions for Dy isotopes in DyPc$_2$
molecules [77.57930329012771]
Nuclear spin levels play an important role in understanding magnetization dynamics and implementation and control of quantum bits in lanthanide-based single-molecule magnets.
We investigate the hyperfine and nuclear quadrupole interactions for $161$Dy and $163$Dy nucleus in anionic DyPc$.
arXiv Detail & Related papers (2020-02-12T18:25:31Z) - Superradiant-like dynamics by electron shuttling on a nuclear-spin
island [0.0]
We investigate superradiant-like dynamics of the nuclear-spin bath in a single-electron quantum dot.
We derive the minimum shuttling time which allows to escape the adiabatic spin evolution.
We stress the important role played by non-adiabatic shuttling in lifting the Coulomb blockade.
arXiv Detail & Related papers (2020-02-04T10:53:56Z) - Optimal coupling of HoW$_{10}$ molecular magnets to superconducting
circuits near spin clock transitions [85.83811987257297]
We study the coupling of pure and magnetically diluted crystals of HoW$_10$ magnetic clusters to microwave superconducting coplanar waveguides.
Results show that engineering spin-clock states of molecular systems offers a promising strategy to combine sizeable spin-photon interactions with a sufficient isolation from unwanted magnetic noise sources.
arXiv Detail & Related papers (2019-11-18T11:03:06Z)
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.