Decoherence and quantum steering of accelerated qubit–qutrit system

Quantum measurement and decoherence

Distribution functions defined in accord with the quantum theory of measurement are combined with results obtained from the quantum Langevin equation to discuss decoherence in quantum Brownian motion. Closed form expressions for wave packet spreading and the attenuation of coherence of a pair of wave packets are obtained. The results are exact within the context of linear passive dissipation. I...

Quantum Mechanics, and Decoherence

State-reduction and the notion of “actuality” are compared to “passage”through time and the notion of “the present”; already in classical relativity the latter give rise to di¢ culties. The solution proposed here is to treat both tense and value-de…niteness as relational properties or “facts as relations”; likewise the notions of change and probability. In both cases “essential” characteristics...

Quantum Communication and Decoherence

Decoherence and quantum fluctuations

The importance of decoherence in the quantum to classical transition is well known. There are many examples where a quantum system undergoes environmentally induced decoherence, such as the electron wave function in a lowdimensional solid, an atom trapped in a quantum optical system, and an isolated quantum system coupled to a measuring apparatus. It has also been suggested that the decoherence...

Quantum Coherence and Decoherence

31 Recently, Aharonov, Anandan and Vaidman [1,2] showed t hat the wavefunction of a si ngle quantum system could be determined from t he resu lts of a series of "protective measurements" performed on the system. In t he protective measurement scheme, a-prio ri knowledge of the wavefundion of the system is used in order to measure t his system and protect its wavefunction from changing at the sa...