Qubit state guidance without feedback

Abstract

We study a protocol for two-qubit state guidance that does not rely on feedback mechanisms. In our scheme, entanglement can be concentrated by arranging the interactions of the qubits with a continuous variable ancilla. By properly post-selecting the outcomes of repeated measurements of the state of the ancilla, the qubit state is driven to have a desired amount of purity and entanglement. We stress the primary role played by the first iterations of the protocol. Inefficiencies in the detection operations can be fully taken into account.

7 pages, 6 figures, RevTeX4

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Cited by in corpus (11)

• Quantum Zeno dynamics: mathematical and physical aspects
• Enhanced dynamical entanglement transfer with multiple qubits
• Efficient Generation of a Maximally Entangled State by Repeated On- and Off-Resonant Scattering of Ancilla Qubits
• Enhancing non-classicality in mechanical systems
• Entanglement generation in harmonic chains: tagging by squeezing
• Influence of dissipation on the extraction of quantum states via repeated measurements
• Estimation of the Repeatedly-Projected Reduced Density Matrix under Decoherence
• Driven optomechanical systems for mechanical entanglement distribution
• Distillation by repeated measurements: continuous spectrum case
• Oscillations of the purity in the repeated-measurement-based generation of quantum states
• Sensitivity of Measurement-Based Purification Processes to Inner Interactions