Practical Entanglement Estimation for Spin-System Quantum Simulators

Autor:	Marty, O., Cramer, M., Plenio, M. B.
Rok vydání:	2015
Předmět:	Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Quantum Gases Condensed Matter - Superconductivity
Zdroj:	Phys. Rev. Lett. 116, 105301 (2016)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.116.105301
Popis:	We present practical methods to measure entanglement for quantum simulators that can be realized with trapped ions, cold atoms, and superconducting qubits. Focussing on long- and short-range Ising-type Hamiltonians, we introduce schemes that are applicable under realistic experimental conditions including mixedness due to, e.g., noise or temperature. In particular, we identify a single observable whose expectation value serves as a lower bound to entanglement and which may be obtained by a simple quantum circuit. As such circuits are not (yet) available for every platform, we investigate the performance of routinely measured observables as quantitative entanglement witnesses. Possible applications include experimental studies of entanglement scaling in critical systems and the reliable benchmarking of quantum simulators. Comment: 9 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1504.03572 Zobrazit plný text záznamu View this record from Arxiv