A direct measurement method of quantum relaxation time

Simulation of Direct Pumping of Quantum Dots in a Quantum Dot Laser

In this paper, the nonlinear rate equations governing a quantum dot laser isused to simulate the transient as well as the steady-state behaviors of the laser.Computation results show that the rate equations are capable of simulating true behaviorof a quantum dot laser. Then, the pump rates of the rate equations (which show indirectelectrical pumping of the quantum dots through a wetting layer) ...

Decoherence and relaxation of a superconducting quantum bit during measurement

During measurement, information is transferred from the measured quantum system to the detector via their coupling. The same coupling that extracts information from the quantum system transmits noise from the detector’s environment to the system as well. In this paper, we derive the limit to the measurement efficiency of a superconducting persistent-current qubit measured by a dc superconductin...

Real-time measurement of Brownian relaxation of magnetic nanoparticles by a mixing-frequency method

Time in Quantum Measurement

Based on a model of quantum measurement we derive an estimate for the external measurement-time. Some interesting consequences will be analyzed. Keywords: Quantum Entropy, Energy, Measurement, Time MSC 2000 codes: 94A17, 81P15 Entropy 2006, 8, 182-187 183 1 Introduction Given an apparatus or memory A, a system S and the environment E , the measurement process M can be represented by the followi...

Investigation of Quantum and Classical Models for Molecular Relaxation Using the Direct Simulation Monte Carlo Method

It is widely known that losses due to viscous, thermal and molecular relaxation play an important role in sound propagation. Traditionally, acoustics is concerned with the treatment of the fluid as a (linear) continuum using macroscopic quantities such as velocity and pressure as dependent variables. However, the continuum model has its limitations and the model breaks down for Knudsen numbers ...