Estimating entanglement of unknown states

Abstract

The experimental determination of entanglement is a major goal in the quantum information field. In general the knowledge of the state is required in order to quantify its entanglement. Here we express a lower bound to the robustness of entanglement of a state based only on the measurement of the energy observable and on the calculation of a separability energy. This allows the estimation of entanglement dismissing the knowledge of the state in question.

3 pages, 1 figure. Comments welcome. V2: references updated. Accepted version by Applied Physics Letters

References in corpus (5)

• Scalable multi-particle entanglement of trapped ions
• Quantifying Entanglement with Witness Operators
• Multipartite entanglement in spin chains
• Energy as an Entanglement Witness for Quantum Many-Body Systems
• Thermal entanglement properties of small spin clusters

Cited by in corpus (10)

• Entanglement detection
• Experimental observation of quantum entanglement in low dimensional spin systems
• Concurrence via entanglement witnesses
• Entanglement Theory and the Quantum Simulation of Many-Body Physics
• Multipartite entanglement of superpositions
• Genuine tripartite entanglement in the non-interacting Fermi gas
• Experimental entanglement verification and quantification via uncertainty relations
• Robustness of entangled states that are positive under partial transposition
• Decay of Entanglement for Solid-State Qubits
• Geometrically induced singular behavior of entanglement