Quantum deficits and correlations of two superconducting charge qubits

Abstract

Motivated by recent experiments [Pashkin et al. Nature, \textbf{421}, 823 (2003)] which showed coherent oscillations of two superconducting qubits system, we consider a system of two charge qubits coupled to a common stripline microwave resonator. We discuss the separable and entangled behavior as well as the quantum and classical information deficits. Numerical computation of these quantities for several regimes is performed. We find that for less entangled states the partner can extract much more information by means of classical communication and local operations

References in corpus (12)

• Coupling Superconducting Qubits via a Cavity Bus
• Superconducting Circuits and Quantum Information
• On the quantum, classical and total amount of correlations in a quantum state
• Decoherence in a scalable adiabatic quantum computer
• Rabi oscillations in a qubit coupled to a quantum two-level system
• Radiative properties of a linear chain of coupled qubits
• Switchable coupling between charge and flux qubits
• Synthesis of maximally entangled mixed states and disentanglement in coupled Josephson charge qubits
• Entanglement of superconducting charge qubits by homodyne measurement
• Can quantum correlations be completely quantum?
• Improving Intrinsic Decoherence in Multi-Quantum-Dot Charge Qubits
• Effects of environmental parameters to total, quantum and classical correlations