Physics – Quantum Physics
Scientific paper
2004-02-26
Europhys. Lett. 68, 323 (2004)
Physics
Quantum Physics
7 pages, 5 figures
Scientific paper
10.1209/epl/i2004-10203-9
We show how a qubit can be fault-tolerantly encoded in the infinite-dimensional Hilbert space of an optical mode. The scheme is efficient and realizable with present technologies. In fact, it involves two travelling optical modes coupled by a cross-Kerr interaction, initially prepared in coherent states, one of which is much more intense than the other. At the exit of the Kerr medium, the weak mode is subject to a homodyne measurement and a quantum codeword is conditionally generated in the quantum fluctuations of the intense mode.
Mancini Stefano
Pirandola Stefano
Tombesi Paolo
Vitali David
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