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Related Concept Videos

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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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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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Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
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 Spin01:08

Atomic Nuclei: Nuclear Spin

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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.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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NMRCloudQ: a quantum cloud experience on a nuclear magnetic resonance quantum computer.

Tao Xin1, Shilin Huang2, Sirui Lu1

  • 1Department of Physics, Tsinghua University, Beijing 100084, China.

Science Bulletin
|January 20, 2023
PubMed
Summary

NMRCloudQ offers accessible cloud quantum computing using nuclear magnetic resonance technology. This platform provides a software environment for amateurs and professionals to conduct real quantum experiments with high fidelity qubits.

Keywords:
Gradient ascent pulse engineeringNuclear magnetic resonanceQuantum cloudRandomized benchmarking

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Area of Science:

  • Quantum Information Science
  • Cloud Computing
  • Nuclear Magnetic Resonance (NMR)

Background:

  • Cloud-based quantum computing offers accessible user experience.
  • IBM Q launched a superconducting quantum processor service in 2016.
  • No other platforms have followed IBM Q's cloud service launch.

Purpose of the Study:

  • Introduce NMRCloudQ, a novel cloud quantum computing service.
  • Leverage Nuclear Magnetic Resonance (NMR) for quantum computations.
  • Provide a free, comprehensive software environment for quantum computing access.

Main Methods:

  • Utilized Nuclear Magnetic Resonance (NMR) as the quantum computing platform.
  • Developed a cloud service providing preconfigured quantum information processing packages.
  • Implemented randomized benchmarking tests to assess gate fidelities.

Main Results:

  • Achieved average single-qubit gate fidelity of 99.10%.
  • Achieved average two-qubit gate fidelity of 97.15% with four usable qubits.
  • Demonstrated the viability of NMR for cloud-based quantum computing tasks.

Conclusions:

  • NMRCloudQ provides a practical and accessible entry point to quantum computing.
  • The service aims to democratize access for both novices and experts.
  • Future updates include improved control and a seven-qubit processor.