Decoherence by engineered quantum baths

Abstract

We introduce, and determine decoherence for, a wide class of non-trivial quantum spin baths which embrace Ising, XY and Heisenberg universality classes coupled to a two-level system. For the XY and Ising universality classes we provide an exact expression for the decay of the loss of coherence beyond the case of a central spin coupled uniformly to all the spins of the baths which has been discussed so far in the literature. In the case of the Heisenberg spin bath we study the decoherence by means of the time-dependent density matrix renormalization group. We show how these baths can be engineered, by using atoms in optical lattices.

4 pages, 4 figures

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• Loschmidt echo and dynamical fidelity in periodically driven quantum systems
• Operator fidelity susceptibility, decoherence and quantum criticality
• Bang-Bang control of a qubit coupled to a quantum critical spin bath
• Universal equilibrium distribution after a small quantum quench
• Quantum Critical Dynamics of A Qubit Coupled to An Isotropic Lipkin-Meshkov-Glick Bath
• Ramsey interferometry with a spin embedded in a Coulomb chain
• Unitary equilibration after a quantum quench of a thermal state
• Unified analysis of terminal-time control in classical and quantum systems
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• Loschmidt echo in the Bose-Hubbard model: turning back time in an optical lattice
• Optimal State Manipulation for a Two-Qubit System Driven by Coherent and Incoherent Controls
• Decoherence of a single spin coupled to an interacting spin bath
• Odd thermodynamic limit for the Loschmidt echo
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• Spin chain model for correlated quantum channels
• Effects of dipolar coupling on an entanglement storage device
• Fractal Fidelity as a signature of Quantum Chaos
• Quantum homogenization and state randomization in semi-quantal spin systems
• Decoherence-assisted transport and quantum criticalities
• Can increasing the size and flexibility of a molecule reduce decoherence and prolong charge migration?
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• Spin Bath Decoherence Mediated by Phonons