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Related Concept Videos

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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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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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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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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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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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...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Squeezed Light Induced Symmetry Breaking Superradiant Phase Transition.

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Squeezed light induces quantum phase transitions in qubit systems without ultrastrong coupling. This research reveals a tricritical point and controllable phase transitions, offering insights into quantum optics and condensed matter physics.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Area of Science:

  • Quantum physics
  • Quantum optics
  • Condensed matter physics

Background:

  • Collective quantum systems, such as qubits in optical cavities, are crucial for quantum technologies.
  • Quantum phase transitions (QPTs) typically require ultrastrong coupling between system components.
  • Squeezed light, a non-classical state of light, can modify quantum system dynamics.

Purpose of the Study:

  • To theoretically investigate quantum phase transitions in qubit-cavity systems using squeezed light.
  • To explore the possibility of achieving QPTs without the need for ultrastrong coupling.
  • To identify control mechanisms and potential applications of such transitions.

Main Methods:

  • Theoretical analysis using standard mean-field theory.
  • Modeling of a cavity field squeezed via optical parametric amplification.
  • Derivation of conditions for quantum phase transitions.

Main Results:

  • Squeezed light induces symmetry breaking, leading to QPTs without ultrastrong coupling.
  • A tricritical point is identified where first- and second-order phase transitions merge.
  • Phase transitions are controllable via the nonlinear gain coefficient, influenced by pump field intensity.
  • Optical switching between normal and superradiant phases is achieved by adjusting pump field intensity.

Conclusions:

  • The study demonstrates a novel pathway to induce and control quantum phase transitions using squeezed light.
  • The findings offer new possibilities for manipulating quantum states and implementing optical switches.
  • The proposed mechanism is applicable to diverse quantum systems, including atomic, solid-state, and circuit QED platforms.