Swapping path-spin intraparticle entanglement onto spin-spin interparticle entanglement
Abstract
Based on a scheme that produces an entanglement between the spin and the path variables of a single spin-(1/2) particle (qubit) using a beam-splitter and a spin-flipper, we formulate a procedure for transferring this intraparticle hybrid entanglement to an interparticle entanglement between the spin variables of two other spatially separated spin-(1/2) particles which never interact with each other during the entire process. This procedure of entanglement swapping is accomplished by a Mach-Zehnder setup in conjunction with the Stern-Gerlach measuring device and by using suitable unitary operations. The proposed protocol, thus, enables the use of intraparticle entanglement as a resource —a feature that has remained unexplored.
- Publication:
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EPL (Europhysics Letters)
- Pub Date:
- January 2010
- DOI:
- 10.1209/0295-5075/89/10005
- arXiv:
- arXiv:0909.0425
- Bibcode:
- 2010EL.....8910005A
- Keywords:
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- Quantum Physics
- E-Print:
- 5 pages, 1 Figure