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Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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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The de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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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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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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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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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Nuclear quantum memory for hard x-ray photon wave packets.

Sven Velten1,2, Lars Bocklage1,2, Xiwen Zhang3

  • 1Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.

Science Advances
|June 26, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a room-temperature x-ray quantum memory using nuclear resonant absorbers. This breakthrough extends quantum photonics to hard x-ray energies, enabling precise control of x-ray photon wave packets.

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Area of Science:

  • Quantum optics
  • X-ray science
  • Solid-state physics

Background:

  • Optical quantum memories are crucial for quantum technologies but are limited to optical wavelengths.
  • Advancements in x-ray quantum optics enable extending quantum memory protocols to ultrashort wavelengths.
  • This establishes the foundation for quantum photonics at x-ray energies.

Purpose of the Study:

  • To introduce a novel x-ray quantum memory protocol.
  • To demonstrate the feasibility of quantum information storage and retrieval at hard x-ray energies.
  • To establish a room-temperature solid-state platform for x-ray quantum memory.

Main Methods:

  • Utilizing mechanically driven nuclear resonant 57Fe absorbers.
  • Creating a nuclear absorption spectrum comb structure via the Doppler effect.
  • Employing mechanical motions for precise control of x-ray photon wave packets.

Main Results:

  • Demonstrated a room-temperature nuclear frequency comb for x-ray absorbers.
  • Achieved high accuracy and fidelity in controlling x-ray photon wave packet waveforms.
  • Developed a tunable, robust, and flexible system for x-ray quantum memory.

Conclusions:

  • The developed protocol establishes quantum photonics at x-ray energies.
  • This system offers a versatile platform for compact, solid-state quantum memory at room temperature.
  • The method enables precise waveform control of x-ray photon wave packets using mechanical motion.