Related Experiment Video
Updated: Oct 25, 2025
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.3K
Entanglement protection of classically driven qubits in a lossy cavity
Alireza Nourmandipour1,2, Azar Vafafard3, Ali Mortezapour4
1Department of Physics, Sirjan University of Technology, 7813733385, Sirjan, Iran. anourmandip@sirjantech.ac.ir.
Scientific Reports
|August 11, 2021
Summary
Classical driving fields can protect quantum entanglement between qubits interacting with environments. This research identifies conditions for achieving maximally entangled stationary states, even from initially unentangled states.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Quantum Computing
Background:
- Quantum technologies leverage quantum phenomena like entanglement for novel applications.
- Entanglement is a crucial resource for quantum information processing.
- Protecting entanglement during system manipulation and environmental interaction is a key challenge.
Purpose of the Study:
- To investigate the effect of classical driving fields on entanglement generation between two qubits in a bosonic environment.
- To determine conditions under which classical fields constructively protect entanglement from environmental decay.
- To explore the creation of entangled states, including maximally entangled stationary states, from initial states.
Main Methods:
- Analysis of two interacting qubits within a bosonic environment under the influence of a classical driving field.
- Identification of stationary subspaces in the system's Hilbert space for similar qubits.
- Investigation of entanglement dynamics and steady-state properties in different coupling regimes.
Main Results:
- Classical driving fields can play a constructive role in protecting entanglement, particularly in the strong coupling regime.
- Conditions for achieving maximally entangled stationary states were identified, independent of environmental properties and driving field.
- A factorable (unentangled) initial state can evolve into an entangled state and even an entangled steady-state.
Conclusions:
- Classical driving fields are effective tools for protecting and generating quantum entanglement in qubit systems interacting with environments.
- The study demonstrates the potential for creating robust entangled states, essential for advancing quantum technologies.
- Optimal entanglement protection and generation are achievable under specific conditions, highlighting the importance of controlling quantum dynamics.
Related Concept Videos
01:28Standing Waves in a Cavity
1.1K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.1K
01:14Conservation of Energy in Control Volume
943
Consider a turbine operating under steady-flow conditions. The control volume is drawn around the turbine, with fluid entering at one point and exiting at another. The turbine extracts energy from the fluid, which performs mechanical work (shaft work).
For steady flow systems, the time derivative of the stored energy becomes zero since there is no energy accumulation within the control volume. This simplifies the energy equation to:
For steady flow systems, the time derivative of the stored energy becomes zero since there is no energy accumulation within the control volume. This simplifies the energy equation to:
943
02:45The Quantum-Mechanical Model of an Atom
53.7K
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.
53.7K
01:10First Law: Particles in One-dimensional Equilibrium
7.3K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
7.3K
01:23Atomic Nuclei: Nuclear Relaxation Processes
795
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.
795
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.2K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.2K