Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

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. This...

Atomic Nuclei: Nuclear Spin State Population Distribution

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.

Atomic Nuclei: Types of Nuclear Relaxation

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...

Fermi Level Dynamics

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...

Stability of Equilibrium Configuration

Stability of Equilibrium Configuration

Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...

Atomic Nuclei: Larmor Precession Frequency

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Glucose Hypometabolism Prompts RAN Translation and Exacerbates C9orf72-related ALS/FTD Phenotypes.

bioRxiv : the preprint server for biology·2023

Same author

Light-induced charge generation in polymeric nanoparticles restores vision in advanced-stage retinitis pigmentosa rats.

Nature communications·2022

Same author

Lasing from dot-in-rod nanocrystals in planar polymer microcavities.

RSC advances·2022

Same author

The European Rare Disease Network for HHT Frameworks for management of hereditary haemorrhagic telangiectasia in general and speciality care.

European journal of medical genetics·2021

Same author

Magnetic force fields of isolated small nanoparticle clusters.

Nanoscale·2020

Same author

Safety of direct oral anticoagulants in patients with hereditary hemorrhagic telangiectasia.

Orphanet journal of rare diseases·2019

Search research articles

Related Experiment Video

Updated: Jul 6, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Fidelity decay in trapped bose-einstein condensates.

G Manfredi¹, P-A Hervieux

¹Institut de Physique et Chimie des Matériaux, CNRS and Université Louis Pasteur, BP 43, F-67034 Strasbourg, France. Giovanni.Manfredi@ipcms.u-strabg.fr

Physical Review Letters

|March 21, 2008

Summary

Quantum coherence in Bose-Einstein condensates is measured using quantum fidelity. Fidelity remains constant until a critical time, then drops sharply, offering insights into quantum decoherence dynamics.

More Related Videos

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

Related Experiment Videos

Last Updated: Jul 6, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

Area of Science:

Quantum physics
Atomic physics
Condensed matter physics

Background:

Bose-Einstein condensates (BECs) exhibit quantum coherence.
Quantum fidelity (Loschmidt echo) quantifies the sensitivity of quantum states to perturbations.
Understanding decoherence in BECs is crucial for quantum technologies.

Purpose of the Study:

To investigate the quantum coherence of a Bose-Einstein condensate under a random potential.
To analyze the behavior of quantum fidelity in perturbed BECs.
To identify observable signatures of decoherence in BECs.

Main Methods:

Numerical simulations of a BEC in an anharmonic trap subjected to a laser speckle potential.
Calculation of quantum fidelity (Loschmidt echo) over time.
Analysis of the critical time for fidelity decay.

Main Results:

Quantum fidelity remains constant for a period, then drops abruptly.
The drop in fidelity occurs over a single trap oscillation period.
The critical time for fidelity decay shows logarithmic dependence on atom number and perturbation amplitude.

Conclusions:

The study reveals a distinct signature of decoherence in BECs.
The observed behavior is potentially measurable through interference fringe analysis of two BECs.
This work provides a framework for studying quantum coherence and decoherence in realistic BEC systems.