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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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The Pauli Exclusion Principle03:06

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Nuclear spin-wave quantum register for a solid-state qubit.

Andrei Ruskuc1,2,3, Chun-Ju Wu1,2,3,4, Jake Rochman1,2,3

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Researchers developed a quantum memory using nuclear spins in yttrium orthovanadate. This breakthrough utilizes collective spin excitations for robust quantum information storage and entanglement, advancing quantum networks.

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Area of Science:

  • Quantum Information Science
  • Solid-State Quantum Systems
  • Quantum Computing and Networks

Background:

  • Optically addressable solid-state nuclear spins are vital for quantum technologies.
  • Nuclear-spin-rich hosts, while challenging due to decoherence, offer unique quantum storage potential.
  • Previous efforts have not leveraged dense nuclear spin ensembles for single-spin qubit control.

Purpose of the Study:

  • To develop a quantum control protocol for manipulating nuclear spin states in a dense environment.
  • To utilize collective nuclear spin excitations for quantum memory implementation.
  • To explore the use of nuclear-spin-rich hosts for robust quantum information applications.

Main Methods:

  • Utilized a highly coherent, optically addressed ytterbium-171 (171Yb3+) qubit in yttrium orthovanadate.
  • Developed a dynamic spin-exchange interaction to polarize and excite the neighboring vanadium-51 (51V5+) nuclear spin ensemble.
  • Implemented a quantum memory and demonstrated the preparation and measurement of entangled Bell states.

Main Results:

  • Successfully polarized a dense nuclear spin ensemble and generated collective spin excitations.
  • Implemented a deterministic and reproducible quantum memory based on these collective excitations.
  • Demonstrated the creation and measurement of maximally entangled 171Yb-51V Bell states.

Conclusions:

  • The developed quantum control protocol enables the use of dense nuclear spin baths as a quantum resource.
  • This platform provides a deterministic and reproducible approach to quantum memory, unlike conventional disordered systems.
  • The findings pave the way for building large-scale quantum networks using single rare-earth ion qubits in nuclear-spin-rich materials.