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J. Fiurášek (2004)
Optimal probabilistic cloning and purification of quantum statesPhysical Review A, 70
A. Grudka, A. Wójcik (2003)
How to encode the states of two non-entangled qubits in one qutritPhysics Letters A, 314
C. Hong, Z. Ou, L. Mandel (1987)
Measurement of subpicosecond time intervals between two photons by interference.Physical review letters, 59 18
We present an optical scheme for the recently proposed protocol for encoding arbitrary non-entangled states of two qubits into a state of one qutrit. Our experimental realization uses spatial-mode encoding. Each qudit is thus represented by a single photon propagating in d different optical fibers. The compression of two qubits into one qutrit is realized by an unbalanced beam splitter and a subsequent measurement. After successful encoding of two qubits the receiver could error-free restore any of the two encoded qubit states but not both of them simultaneously. The principle of experiment is based on the interplay of the second-order and fourth-order interference. Further, we propose a possible way for the simultaneous decoding of both qubits but with fidelities less than one.
Acta Physica Hungarica Series B, Quantum Electronics – Springer Journals
Published: Aug 29, 2009
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