Swapping path-spin intraparticle entanglement onto spin-spin interparticle entanglement

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...

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Bibliographic Details
Published in:Europhysics letters 2010-01, Vol.89 (1), p.10005
Main Authors: Adhikari, S, Majumdar, A. S, Home, Dipankar, Pan, A. K
Format: Article
Language:English
Subjects:
03.65.Ud
Devices
Entanglement
Particle spin
Qubits (quantum computing)
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Summary: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.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/89/10005