Initial-state randomness as a universal source of decoherence
arXiv:0805.0523 · doi:10.1103/PhysRevA.78.022105
Abstract
We study time evolution of entanglement between two qubits, which are part of a larger system, after starting from a random initial product state. We show that, due to randomness in the initial product state, entanglement is present only between directly coupled qubits and only for short times. Time dependence of the entanglement appears essentially independent of the specific hamiltonian used for time evolution and is well reproduced by a parameter-free two-body random matrix model.
8 pages, 6 figures
References in corpus (34)
- Entanglement of Formation of an Arbitrary State of Two Qubits
- Mixed State Entanglement and Quantum Error Correction
- Separability Criterion for Density Matrices
- Decoherence, einselection, and the quantum origins of the classical
- Separability of Mixed States: Necessary and Sufficient Conditions
- Purification of Noisy Entanglement and Faithful Teleportation via Noisy Channels
- Finite-Time Disentanglement via Spontaneous Emission
- On the volume of the set of mixed entangled states
- Separability criterion and inseparable mixed states with positive partial transposition
- Dynamics of Loschmidt echoes and fidelity decay
- Creation of Entanglement by Interaction with a Common Heat Bath
- Environment Induced Entanglement in Markovian Dissipative Dynamics
- A comparison of entanglement measures
- Dynamics of Entanglement in One-Dimensional Spin Systems
- Disentanglement and Decoherence by Open System Dynamics
- Teleportation, Bell's Inequalities and Inseparability
- On general relation between quantum ergodicity and fidelity of quantum dynamics
- Is efficiency of classical simulations of quantum dynamics related to integrability?
- Entanglement in spin chains and lattices with long-range Ising-type interactions
- Entanglement, avoided crossings and quantum chaos in an Ising model with a tilted magnetic field
- Progressive Decoherence and Total Environmental Disentanglement
- Multipartite Entanglement in a One-Dimensional Time Dependent Ising Model
- Experimentally friendly geometrical criteria for entanglement
- Entanglement Across a Transition to Quantum Chaos
- Bounds on entanglement in qudit subsystems
- Dynamical phase transitions and temperature induced quantum correlations in an infinite spin chain
- Dynamics of entanglement in quantum computers with imperfections
- Typical entanglement in multi-qubit systems
- Decoherence of two qubit systems: A random matrix description
- Evolution of pairwise entanglement in a coupled n-body system
- Detecting entanglement of random states with an entanglement witness
- Quantum Information Processing in Disordered and Complex Quantum Systems
- Loschmidt echoes in two-body random matrix ensembles
- Entanglement generation resonances in XY chains