Optical implementation of the encoding of two qubits to a single qutrit

Journal Article · Tue Aug 15 04:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.022325· OSTI ID:20853042

Bartuskova, Lucie; Cernoch, Antonin; Fiurasek, Jaromir; Dusek, Miloslav ^[1]; Filip, Radim ^[1]; Soubusta, Jan ^[2]

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1. Department of Optics, Palacky University, 17. listopadu 50, 772 00 Olomouc (Czech Republic)
2. Joint Laboratory of Optics of Palacky University and Institute of Physics of Academy of Sciences of the Czech Republic, 17.listopadu 50A, 779 07 Olomouc (Czech Republic)

We have devised an optical scheme for the recently proposed protocol for encoding two qubits into one qutrit. In this protocol, Alice encodes an arbitrary pure product state of two qubits into a state of one qutrit. Bob can then restore either of the two encoded qubit states error-free but not both of them simultaneously. We have successfully realized this scheme experimentally using spatial-mode encoding. Each qubit (qutrit) was represented by a single photon that could propagate through two (three) separate fibers. We theoretically propose two generalizations of the original protocol. We have found a probabilistic operation that enables us to retrieve both qubits simultaneously with average fidelity above 90% and we have proposed an extension of the original encoding transformation to encode N qubits into one (N+1)-dimensional system.

• OSTI ID: 20853042
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ERRORS
FIBERS
IMPLEMENTATION
ONE-DIMENSIONAL CALCULATIONS
OPERATION
OPTICS
PHOTONS
PROBABILISTIC ESTIMATION
QUANTUM COMPUTERS
QUBITS
TRANSFORMATIONS