Synthesis of maximally entangled mixed states and disentanglement in coupled Josephson charge qubits
arXiv:0804.4860 · doi:10.1140/epjd/e2007-00333-0
Abstract
We analyze a controllable generation of maximally entangled mixed states of a circuit containing two-coupled superconducting charge qubits. Each qubit is based on a Cooper pair box connected to a reservoir electrode through a Josephson junction. Illustrative variational calculations were performed to demonstrate the effect on the two-qubits entanglement. At sufficiently deviation between the Josephson energies of the qubits and/or strong coupling regime, maximally entangled mixed states at certain instances of time is synthesized. We show that entanglement has an interesting subsequent time evolution, including the sudden death effect. This enables us to completely characterize the phenomenon of entanglement sharing in the coupling of two superconducting charge qubits, a system of both theoretical and experimental interest.
arXiv comment11 pages, 7 figures
References in corpus (31)
- Entanglement of Formation of an Arbitrary State of Two Qubits
- Separability Criterion for Density Matrices
- A computable measure of entanglement
- Entanglement of a Pair of Quantum Bits
- Coherent control of macroscopic quantum states in a single-Cooper-pair box
- Finite-Time Disentanglement via Spontaneous Emission
- Concepts and methods in the theory of open quantum systems
- Quantum oscillations in two coupled charge qubits
- Quantum Open System Theory: Bipartite Aspects
- Dark periods and revivals of entanglement in a two qubit system
- Maximizing the entanglement of two mixed qubits
- Entanglement Teleportation via Werner States
- Decoherence-Free Subspaces and Subsystems
- Disentanglement and Decoherence by Open System Dynamics
- Qubit Disentanglement and Decoherence via Dephasing
- Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout
- Scalable quantum computing with Josephson charge qubits
- Phonon decoherence of quantum entanglement: Robust and fragile states
- Controllable coupling between flux qubits
- Progressive Decoherence and Total Environmental Disentanglement
- Quantum interference and evolution of entanglement in a system of three-level atoms
- Decoherence of a Measure of Entanglement
- Disentanglement and decoherence in two-spin and three-spin systems under dephasing
- Generation and purification of maximally-entangled atomic states in optical cavities
- Rapid state purification protocols for a Cooper pair box
- A Bell pair in a generic random matrix environment
- Hybridized solid-state qubit in the charge-flux regime
- Entanglement Decay Versus Energy Change: A Model
- Entanglement and spin squeezing in the two-atom Dicke model
- Spectroscopy of a Cooper-Pair box in the Autler-Townes configuration
- Sudden death and long-living of entanglement in an ion-trap laser
Cited by in corpus (4)
- Finite-time destruction of entanglement and non-locality by environmental influences
- Quantum entanglement and disentanglement of multi-atom systems
- Dynamics of Bloch vectors and the channel capacity of a non identical charged qubit pair
- Quantum deficits and correlations of two superconducting charge qubits