2009/09/30 by Analía Zwick, Analia Zwick, Omar Osenda · 1 citation
Computer Science · Mathematics · Physics and Astronomy · #Amplitude damping channel #Bipartite graph #Chain (unit) #Computer science #Concurrence #Condensed matter physics #Mathematics #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum discord #Quantum entanglement #Quantum many-body systems #Quantum mechanics #Quantum state #Spins #Telecommunications #Transmission (telecommunications) #quant-ph
paper · pdf · doi:10.1088/1751-8113/44/10/105302
published as J. Phys. A: Math. Theor. 44 105302 (2011)
openalex publication_date 2011/02/17 · arxiv created 2011/03/02 · arxiv updated 2015/05/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
One spin excitation states are involved in the transmission of quantum states and entanglement through a quantum spin chain, the localization properties of these states are crucial to achieve the transfer of information from one extreme of the chain to the other. We investigate the bipartite entanglement and localization of the one excitation states in a quantum XX chain with one impurity. The bipartite entanglement is obtained using the concurrence and the localization is analyzed using the inverse participation ratio (IPR). Changing the strength of the exchange coupling of the impurity allows us to control the number of localized or extended states. The analysis of the IPR allows us to identify scenarios where the transmission of quantum states or entanglement can be achieved with a high degree of fidelity. In particular, we identify a regime where the transmission of quantum states between the extremes of the chain is executed in a short transmission time ∼ N /2, where N is the number of spins in the chain, and with a large fidelity.