Please use this identifier to cite or link to this item: http://hdl.handle.net/10497/17591
Title: 
Authors: 
Issue Date: 
2008
Citation: 
Durt, T., Kwek, L. C., & Kaszlikowski, D. (2008). Generalized flying-qudit scheme in arbitrary dimensions. Physical Review A, 77(4), 042318.
Abstract: 
We generalize in higher dimensions the so-called “flying-qubit scheme” that was described in the paper by
Lim, Beige, and Kwek Phys. Rev. Lett. 95, 030505 2005 . In that paper, the authors proposed a scheme
according to which distant atoms get entangled during a measurement, in the Bell basis, of photons flying
qubits emitted by them. We show that although in principle a generalization of this scheme to arbitrary
dimensions is possible, this theoretical proposal is not presently feasible in all dimensions because only qubit
Bell states have been successively measured until now. Nevertheless we show that a many-qubits generalization
of the flying-qubit scheme factorizes and reduces to the realization, in parallel, of many individual
single-qubit schemes, for which it is known that they are realizable experimentally with the techniques that are
available today. In other words, our approach shows that when d is an even prime power d=2m , the flyingqudit
scheme reduces to m flying-qubit schemes. For d=2m and arbitrary m the implementation of a generalized,
maximally entangling, conditional qudit phase gate “with insurance” or “repeat-until-success” is thus
shown to be feasible in practice by coupling m pairs of two-level atoms to m pairs of two-level polarized
photons. Moreover, due to the parallelism of the task, the time necessary for completing successfully the task
scales logarithmically in a function of m while at the same time the dimension of the Hilbert space scales
exponentially which presents promising perspectives regarding quantum informational realizations such as the
quantum computer.
URI: 
ISSN: 
1050-2947 (print)
1094-1622 (online)
Other Identifiers: 
10.1103/PhysRevA.77.042318
Website: 
Appears in Collections:Journal Articles

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