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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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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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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

14.8K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Quantum critical detector: amplifying weak signals using discontinuous quantum phase transitions.

Li-Ping Yang, Zubin Jacob

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    Summary

    We developed a quantum critical detector (QCD) that uses a quantum phase transition to amplify weak signals. This novel detector shows giant sensitivity and potential for applications in metrology and single photon detection.

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    Area of Science:

    • Quantum physics
    • Condensed matter physics
    • Device engineering

    Background:

    • Weak signal detection is crucial for scientific advancement.
    • Existing detectors face limitations in sensitivity and noise reduction.
    • Quantum phase transitions offer unique properties for novel device functionalities.

    Purpose of the Study:

    • To propose and theoretically model a quantum critical detector (QCD) for signal amplification.
    • To investigate the use of first-order discontinuous quantum phase transitions for enhanced sensitivity.
    • To explore the potential of QCDs in metrology, weak signal amplification, and single photon detection.

    Main Methods:

    • Theoretical modeling of a spin-boson system to describe QCD dynamics.
    • Numerical simulations to demonstrate dynamical features of the quantum phase transition.
    • Analysis of system's sensitivity, quantum gain, and signal-to-noise ratio scaling with system size.

    Main Results:

    • Demonstrated time-dependent quantum gain in a system of 80 interacting spins.
    • Showcased giant sensitivity (χ ∝ N²) at the critical point.
    • Observed linear scaling of quantum gain and signal-to-quantum noise ratio with spin number N.

    Conclusions:

    • Engineering first-order discontinuous quantum phase transitions enables highly sensitive detectors.
    • The proposed quantum critical detector offers a promising platform for advanced metrology and sensitive signal detection.
    • The findings pave the way for practical applications in areas like single photon detection.