Characterization of a π-phase shift quantum gate for coherent-state qubits
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We discuss the characterization of a p-phase shift quantum gate acting on a qubit encoded in superpositions of coherent states. We adopt a technique relying on some a priori knowledge about the physics underlying the functioning of the device. A parameter summarizing the global quality of the quantum gate is obtained by 'virtually' processing an entangled state. With such an approach, we can facilitate the characterization of our gate, focusing on the useful subspace rather than on the entire phase space.
New Journal of Physics
© 2012 Institute of Physics Publishing. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Page numbers are not for citation purposes. Instead, this article has the unique article number of 013017.
Quantum Information, Computation and Communication