Related Experiment Video
Updated: Sep 23, 2025
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
14.7K
Quantum Squeezing and Sensing with Pseudo-Anti-Parity-Time Symmetry
Xi-Wang Luo1, Chuanwei Zhang1, Shengwang Du1
1Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080-3021, USA.
Physical Review Letters
|May 16, 2022
Summary
Researchers developed a quantum pseudo-anti-PT (pseudo-APT) symmetry in bosonic systems, avoiding noise. This symmetry breaking creates an exceptional point, enabling ultraprecision quantum sensing through altered squeezing dynamics.
Area of Science:
- Quantum physics
- Non-Hermitian systems
- Quantum sensing
Background:
- Parity-time (PT) symmetry enriches non-Hermitian physics.
- Realizing quantum PT symmetry is hindered by symmetry-breaking Langevin noises.
Purpose of the Study:
- Construct a quantum pseudo-anti-PT (pseudo-APT) symmetry in a two-mode bosonic system.
- Investigate spontaneous pseudo-APT symmetry breaking and its impact on quantum dynamics.
- Explore applications in ultraprecision quantum sensing.
Main Methods:
- Theoretical construction of quantum pseudo-APT symmetry in a two-mode bosonic system.
- Analysis of spontaneous symmetry breaking and its relation to exceptional points.
- Characterization of quantum squeezing dynamics across the exceptional point.
Main Results:
- Successful construction of quantum pseudo-APT symmetry without Langevin noises.
- Demonstration of spontaneous pseudo-APT symmetry breaking leading to an exceptional point.
- Observation of distinct quantum squeezing dynamics (exponential increase vs. periodic oscillation) in symmetric and broken regions.
Conclusions:
- The developed pseudo-APT symmetry offers a novel platform for studying quantum non-Hermitian physics.
- Exceptional points associated with pseudo-APT symmetry breaking enable ultraprecision quantum sensing.
- Experimental realization is feasible in nonlinear optics and atomic Bose-Einstein condensates.
Related Concept Videos
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
1.2K
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...
1.2K
01:21Properties of Fourier series II
291
Time scaling of signals is a crucial concept in signal processing that affects the Fourier series representation without altering its coefficients. The process modifies the fundamental frequency, thereby changing how the series represents the signal over time. This principle is essential in various applications, including audio and image processing, where signal manipulation is frequent. Understanding function symmetries is fundamental to simplifying the Fourier series.
A function f(t) is...
A function f(t) is...
291
01:10Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
1.5K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1 triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.5K
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.1K
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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
03:06The Pauli Exclusion Principle
51.8K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
51.8K
01:28Symmetry in Maxwell's Equations
3.6K
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
3.6K