Engineering multiphoton states for linear optics computation

Aniello, Paolo and Lupo, Cosmo and Napolitano, Mario and Paris, Matteo G.A. (2006) Engineering multiphoton states for linear optics computation. The European Physical Journal D . (Sottomesso)

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Transformations achievable by linear optical components allow to generate the whole unitary group only when restricted to the one-photon subspace of a multimode Fock space. In this paper, we address the more general problem of encoding quantum information by multiphoton states, and elaborating it via ancillary extensions, linear optical passive devices and photodetection. Our scheme stems in a natural way from the mathematical structures underlying the physics of linear optical passive devices. In particular, we analyze an economical procedure for mapping a fiducial 2-photon 2-mode state into an arbitrary 2-photon 2-mode state using ancillary resources and linear optical passive N-ports assisted by post-selection. We found that adding a single ancilla mode is enough to generate any desired target state. The effect of imperfect photodetection in post-selection is considered and a simple trade-off between success probability and fidelity is derived.

Tipologia di documento:Preprint
Parole chiave:quantum information, quantum computation, linear optics
Settori scientifico-disciplinari MIUR:Area 02 Scienze fisiche > FIS/02 FISICA TEORICA, MODELLI E METODI MATEMATICI
Stato del full text:Accessibile
Data:31 Maggio 2006
Stato dell'Eprint:Sottomesso
Titolo rivista/pubblicazione:The European Physical Journal D
Numero di sistema:380
Depositato il:21 Giugno 2006
Ultima modifica:04 Febbraio 2009 09:38

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