3 research outputs found
Qubit Entanglement Driven by Remote Optical Fields
We examine the entanglement between two qubits, supposed to be remotely
located and driven by independent quantized optical fields. No interaction is
allowed between the qubits, but their degree of entanglement changes as a
function of time. We report a collapse and revival of entanglement that is
similar to the collapse and revival of single-atom properties in cavity QED.Comment: v3, major changes, published in Optics Letter
Quantum storage and information transfer with superconducting qubits
We design theoretically a new device to realize the general quantum storage
based on dcSQUID charge qubits. The distinct advantages of our scheme are
analyzed in comparison with existing storage scenarios. More arrestingly, the
controllable XY-model spin interaction has been realized for the first time in
superconducting qubits, which may have more potential applications besides
those in quantum information processing. The experimental feasibility is also
elaborated.Comment: 4 pages, 2 figure
Coherent State Control of Non-Interacting Quantum Entanglement
We exploit a novel approximation scheme to obtain a new and compact formula
for the parameters underlying coherent-state control of the evolution of a pair
of entangled two-level systems. It is appropriate for long times and for
relatively strong external quantum control via coherent state irradiation. We
take account of both discrete-state and continuous-variable degrees of freedom.
The formula predicts the relative heights of entanglement revivals and their
timing and duration.Comment: Published in PRA, 10 pages, 7 figure