| Issue |
EPL
Volume 89, Number 1, January 2010
|
|
|---|---|---|
| Article Number | 10005 | |
| Number of page(s) | 5 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/89/10005 | |
| Published online | 18 January 2010 | |
Swapping path-spin intraparticle entanglement onto spin-spin interparticle entanglement
1
S. N. Bose National Centre for Basic Sciences - Salt Lake, Kolkata-700098, India
2
CAPSS, Department of Physics, Bose Institute - Salt Lake, Kolkata-700091, India
Corresponding authors: satyabrata@bose.res.in archan@bose.res.in dhome@bosemain.boseinst.ac.in apan@bosemain.boseinst.ac.in
Received:
13
October
2009
Accepted:
9
December
2009
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.
PACS: 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)
© EPLA, 2010
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