Related Experiment Video
Updated: Aug 7, 2026
05:30
Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
Published on: September 8, 2023
Steering population flow in coherently driven lossy quantum ladders
Leonid P Yatsenko1, Andon A Rangelov, Nikolay V Vitanov
1Institute of Physics, National Academy of Science of Ukraine, Prospect Nauki 46, Kiev-39 03650, Ukraine.
The Journal of Chemical Physics
|July 26, 2006
Summary
This study details a laser technique for controlling population flow in a three-level quantum system. Researchers can precisely direct excited-state populations, managing fluorescence loss from specific levels.
Area of Science:
- Quantum mechanics
- Atomic physics
- Laser spectroscopy
Background:
- Adiabatic passage is a technique to steer quantum systems.
- Controlling population flow in excited states is crucial for quantum technologies.
- Previous experiments demonstrated adiabatic control in a three-level system.
Purpose of the Study:
- To present a detailed theory for adiabatic control of population flow.
- To investigate control over population loss via fluorescence from excited states.
- To analyze a three-level ladder quantum system (1-2-3).
Main Methods:
- Theoretical modeling of a three-level ladder system.
- Analysis of laser excitation schemes.
- Derivation of analytical results for quasi-adiabatic passage.
Main Results:
- A laser excitation scheme is described for controlling population distribution.
- The scheme allows adjustable alteration of population lost through specific excited states.
- Analytical conditions for quasi-adiabatic passage are presented.
Conclusions:
- The presented theory provides a framework for precise population control in quantum systems.
- This method enables manipulation of fluorescence loss pathways.
- The findings support experimental demonstrations of quantum state control.
Related Concept Videos
01:11Design Example: Forces in Sluice Gate
In hydraulic engineering, sluice gates are essential for managing water flow through channels, reservoirs, and irrigation systems. Sluice gates, acting as vertical barriers, regulate water by adjusting the gate's opening height, which changes the velocity and pressure of water flowing beneath the gate. Understanding the forces involved is crucial to designing sluice gates that can withstand dynamic pressure differences, especially when the gate is closed or partially open.
Key variables in...
Key variables in...
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
01:24Laminar Flow: Problem Solving
Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower indicates...
01:21Boundary Conditions: Lossless Lines
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
01:28Conservation of Linear Momentum for a System of Particles
In the dynamic realm of billiards, a fascinating interplay of forces governs the motion of cue balls and stationary balls. When the cue ball collides with a stationary ball, linear momentum is exchanged. The cue ball imparts a fraction of its linear momentum to the stationary ball, causing the cue ball to decelerate while initiating the motion of the stationary ball.
The impulsive force at play during this interaction is of extremely short duration, rendering its impulse negligible. When...
The impulsive force at play during this interaction is of extremely short duration, rendering its impulse negligible. When...
01:10Entropy Change in Reversible Processes
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.