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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Estimation of the Physical Quantities01:05

Estimation of the Physical Quantities

On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...
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Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Robust quantum enhanced phase estimation in a multimode interferometer [corrected].

J J Cooper1, D W Hallwood, J A Dunningham

  • 1School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom.

Physical Review Letters
|May 1, 2012
PubMed
Summary
This summary is machine-generated.

Multimode interferometers using ultracold atoms offer enhanced quantum measurement precision and robustness against particle loss. These advanced quantum sensing techniques outperform traditional two-mode schemes, even with significant atom loss.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Quantum sensing

Background:

  • Quantum interferometry offers enhanced measurement precision.
  • Particle loss in quantum systems degrades measurement performance.
  • Two-mode interferometers have limited robustness to particle loss.

Purpose of the Study:

  • To investigate quantum-enhanced measurement precision using ultracold atoms in multimode interferometers.
  • To demonstrate robustness against particle loss in quantum sensing schemes.
  • To compare the performance of multimode versus two-mode interferometers.

Main Methods:

  • Utilizing correlation properties of ultracold atoms in a multimode interferometer.
  • Developing a ring interferometer for rotational motion sensing with fermionic atoms.
  • Implementing a scheme with strongly interacting bosons.

Main Results:

  • Achieved quantum enhanced measurement precision with strong robustness to particle loss.
  • Demonstrated an uncertainty scaling of 1/(N√η) for noninteracting fermionic atoms, outperforming the shot-noise limit.
  • Bosonic scheme achieved comparable precision with improved readout.

Conclusions:

  • Multimode interferometers provide superior robustness to particle loss compared to two-mode schemes.
  • Ultracold atom interferometry offers a promising platform for high-precision, loss-tolerant quantum sensing.
  • Advanced quantum techniques can overcome limitations of traditional measurement methods.