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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Optimal Pulse Design for Dissipative-Stimulated Raman Exact Passage.

Kaipeng Liu1,2, Dominique Sugny1, Xi Chen3,4

  • 1Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS UMR 6303, Université de Bourgogne, BP 47870, 21078 Dijon, France.

Entropy (Basel, Switzerland)
|May 27, 2023
PubMed
Summary
This summary is machine-generated.

New quantum control methods optimize energy and time for lossy systems. Stimulated Raman Exact Passage (STIREP) offers faster, more accurate, and robust quantum transfers compared to STIRAP, especially for low loss.

Keywords:
quantum controlquantum system driven by an external field

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Area of Science:

  • Quantum physics
  • Quantum control
  • Atomic, molecular, and optical physics

Background:

  • Quantum control of lossy systems often uses adiabatic passage via approximate dark states.
  • Stimulated Raman Adiabatic Passage (STIRAP) is a key example, but can be inefficient for lossy excited states.

Purpose of the Study:

  • To design more efficient quantum control routes for lossy systems.
  • To optimize quantum state transfer based on energy or time minimization.

Main Methods:

  • Systematic optimal control study using the Pontryagin maximum principle.
  • Design and analysis of alternative adiabatic passage sequences.

Main Results:

  • Optimal control strategies were identified for both energy and time minimization.
  • Energy minimization yielded simple π-pulse sequences for low loss.
  • Time minimization resulted in an Intuitive/Counterintuitive/Intuitive (ICI) sequence, forming Stimulated Raman Exact Passage (STIREP).
  • STIREP demonstrated superior speed, accuracy, and robustness over STIRAP for low admissible loss.

Conclusions:

  • Optimal control provides efficient pathways for quantum control in lossy systems.
  • STIREP represents a significant advancement over STIRAP for time-optimized quantum state transfer.
  • The developed methods offer practical improvements for quantum technologies operating with inherent losses.