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Quantum decoherence in a pragmatist view:Part I
Quantum decoherence pragmatist quantum interpretation
2016/5/30
The quantum theory of decoherence plays an important role in a pragmatist interpretation of quantum theory. It governs the descriptive content of claims about values of physical magnitudes and offers ...
Quantum decoherence in a pragmatist view:Resolving the measurement problem
Measurement problem quantum theory pragmatist interpretation quantum fields
2016/5/30
This paper aims to show how adoption of a pragmatist interpretation permits a satisfactory resolution of the quantum measurement problem. The classic measurement problem dissolves once one recognizes ...
Spin bath-mediated decoherence in superconductors
Squid tunnel paramagnetic nuclear spin electronic excited state isotope purification
2014/12/22
We consider a SQUID tunneling between 2 nearly degenerate flux states. Decoherence caused by paramagnetic and nuclear spins in the low-T limit is shown to be much stronger than that from electronic ex...
Decoherence and quantum walks: Anomalous diffusion and ballistic tails
Strong coupling density matrix particles lattice
2014/12/20
The common perception is that strong coupling to the environment will always render the evolution of the system density matrix quasiclassical (in fact, diffusive) in the long time limit. We present he...
Ehrenfest dynamics is purity non-preserving: a necessary ingredient for decoherence
Ehrenfest dynamics purity non-preserving necessary ingredient decoherence Chemical Physics
2012/5/28
We discuss the evolution of purity in mixed quantum/classical approaches to electronic nonadiabatic dynamics in the context of the Ehrenfest model. We claim that the evolution of a statistical Ehrenfe...
Interplay between coherence and decoherence in LHCII photosynthetic complex
LHCII photosynthetic complex
2011/9/13
This paper investigates the dynamics of excitonic transport in photocomplex LHCII, the primary component of the photosynthetic apparatus in green plants. The dynamics exhibits a strong interplay betwe...
Immunity of information encoded in decoherence-free subspaces to particle loss
information decoherence-free subspaces particle loss
2011/8/17
Abstract: We demonstrate that for an ensemble of qudits, subjected to collective decoherence in the form of perfectly correlated random SU(d) unitaries, quantum superpositions stored in the decoherenc...
The talk, based on [1], analyzes the consequences of the assumption that the effects of quantum coherence and the resulting angular ordering in QCD cascades are disrupted within the hot fireball creat...
We address the issue why a cosmological constant (dark energy) possesses a small positive value instead of being zero. Motivated by the cosmic landscape picture, we mimic the dark energy by a scalar f...
Decoherence in a Double-Dot Aharonov-Bohm Interferometer
Decoherence Double-Dot Aharonov-Bohm Interferometer
2010/11/23
Coherence in electronic interferometers is typically believed to be restored fully in the limit of small voltages, frequencies and temperatures. However, it is crucial to check this essentially pertur...
A general and solvable random matrix model for spin decoherence
general solvable random matrix model spin decoherence
2010/12/1
We propose and solve a simple but very general quantum model of an SU(2)spin interacting with a large external system with N states. The coupling is described by a random hamiltonian in a new general ...
Designing reservoirs for 1/t decoherence of a qubit
reservoirs decoherence Quantum Physics
2010/11/8
Anomalous decoherence in the Jaynes-Cummings model emerges for a certain class of bosonic reservoirs, described by spectral densities with a band edge frequency coinciding with the qubit transition fr...
Comparison of analytical and numerical methods and the effect of bath coupling on the quantum decoherence
comparison analytical and numerical methods quantum decoherence
2010/11/8
The dynamics of a qubit in a structured environment is investigated theoretically. One point of view of the model is the spin-boson model with a Lorentz shaped spectral density. An alternative view is...
The exact dynamics of a Jaynes-Cummings model for a qubit interacting with a continuous distribution of bosons, characterized by a special form of the spectral density, is evaluated analytically. The ...
Weak localization, Aharonov-Bohm oscillations and decoherence in arrays of quantum dots
Weak localization Aharonov-Bohm oscillations decoherence
2010/11/24
Combining scattering matrix theory with non-linear σ-model and Keldysh technique we develop a
unified theoretical approach enabling one to non-perturbatively study the effect of electron-electron int...