Spin squeezing and concurrence

Abstract

We study the relations between spin squeezing and concurrence, and find that they are qualitatively equivalent for an ensemble of spin-1/2 particles with exchange symmetry and parity, if we adopt the spin squeezing criterion given by the recent work (G. Toth et al. Phys. Rev. Lett. 99, 250405 (2007)). This suggests that the spin squeezing has more intimate relations with pairwise entanglement. We exemplify the result by considering a superposition of two Dicke states.

6 pages, 2 figures, one table

References in corpus (5)

• Entanglement in a second order quantum phase transition
• Spin squeezing and entanglement
• Sudden vanishing of spin squeezing under decoherence
• Concurrence in collective models
• Spin Squeezing, Negative Correlations, and Concurrence in the Quantum Kicked Top Model

Cited by in corpus (8)

• Quantum spin squeezing
• Multipartite entanglement and high precision metrology
• Extracting entanglement from identical particles
• Spin Squeezing under Non-Markovian Channels by Hierarchy Equation Method
• Single Shot Quantum State Estimation via a Continuous Measurement in the Strong Backaction Regime
• Spin squeezing and concurrence under Lee-Yang dephasing channels
• Pairwise quantum discord for a symmetric multi-qubit system in different types of noisy channels
• Entanglement distribution in fermion model with long-range interaction