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Quantum discord of two-qubit X states
Quantum discord provides a measure for quantifying quantum correlations beyond entanglement and is very hard to compute even for two-qubit states because of the minimization over all possible…
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Effects of reservoir squeezing on quantum systems and work extraction.
TLDR
A quantum Otto engine cycle in which the working substance contacts with squeezed reservoirs during the two quantum isochoric processes is established and it can be understood as quantum fuel is more efficient than the classical one.
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Time-dependent decoherence-free subspace
TLDR
The t-DFS is defined and a necessary and sufficient condition is presented, which show that this time-dependent decoherence-free subspace is not trivial, when the dimension of the t- DFS varies.
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Adiabatic approximation in open systems: an alternative approach
The adiabatic approximation in open systems is formulated through the effective Hamiltonian approach. By introducing an ancilla, we embed the open system dynamics into a non-Hermitian quantum…
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Optimal Lyapunov-based quantum control for quantum systems
Quantum Lyapunov control was developed in order to transform a quantum system from arbitrary initial states to a target state. The idea is to find control fields that steer the Lyapunov function to…
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Driving quantum systems into decoherence-free subspaces by Lyapunov control
We present a scheme to drive a finite-dimensional quantum system into the decoherence-free subspaces(DFS) by Lyapunov control. Control fields are established by Lyapunov function. This proposal works…
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An alternative quantum fidelity for mixed states of qudits
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Quantum computing in optical microtraps based on the motional states of neutral atoms
We investigate quantum computation with neutral atoms in optical microtraps where the qubit is implemented in the motional states of the atoms, i.e., in the two lowest vibrational states of each…
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Adiabatic evolution of decoherence-free subspaces and its shortcuts
The adiabatic theorem and "shortcuts to adiabaticity" for the adiabatic dynamics of time-dependent decoherence-free subspaces are explored in this paper. Starting from the definition of the dynamical…
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Entanglement of two atoms through different couplings and thermal noise
The entanglement of two atoms is studied when the two atoms are coupled to a single-mode thermal field with different couplings. The different couplings of the two atoms is favourable to…
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