Volume 86, Number 3, May 2009
Article Number 30005
Number of page(s) 4
Section General
Published online 21 May 2009
EPL, 86 (2009) 30005
DOI: 10.1209/0295-5075/86/30005

Experimentally testable geometric phase of sequences of Everett's relative quantum states

E. Sjöqvist

Department of Quantum Chemistry, Uppsala University - Box 518, SE-751 20 Uppsala, Sweden, EU

received 9 March 2009; accepted in final form 15 April 2009; published May 2009
published online 21 May 2009

Everett's concept of relative state is used to introduce a geometric phase that depends nontrivially on entanglement in a pure quantum state. We show that this phase can be measured in multiparticle interferometry. A correlation-dependent generalization of the relative state geometric phase to mixed quantum states is outlined.

03.65.Vf - Phases: geometric; dynamic or topological.
03.65.Ud - Entanglement and quantum nonlocality (e.g., EPR paradox, Bell's inequalities, GHZ states, etc.).

© EPLA 2009