Universal Continuous-Variable State Orthogonalizer and Qubit Generator

Year: 2016

Authors: Coelho A. S., Costanzo L. S., Zavatta A., Hugues C., Kim M. S., Bellini M.

Autors Affiliation: Istituto Nazionale di Ottica (INO-CNR), Largo E. Fermi 6, Florence, 50125, Italy; LENS, Department of Physics, University of Firenze, Sesto Fiorentino, Florence, 50019, Italy; QOLS, Blackett Laboratory, Imperial College London, SW7 2AZ, United Kingdom; Departamento de Engenharia, Centro Universitbrio UNINOVAFAPI, Teresina, Piaun, 64073-505, Brazil

Abstract: We experimentally demonstrate a universal strategy for producing a quantum state that is orthogonal to an arbitrary, infinite-dimensional, pure input one, even if only a limited amount of information about the latter is available. Arbitrary coherent superpositions of the two mutually orthogonal states are then produced by a simple change in the experimental parameters. We use input coherent states of light to illustrate two variations of the method. However, we show that the scheme works equally well for arbitrary input fields and constitutes a universal procedure, which may thus prove a useful building block for quantum state engineering and quantum information processing with continuous-variable qubits.


Volume: 116 (11)      Pages from: 110501-1  to: 110501-5

More Information: A. Z., L. S. C., and M. B. acknowledge the support of the EU under the ERA-NET CHIST-ERA project QSCALE, and of the MIUR under the Contract No. FIRB RBFR10M3SB. M. S. K. and C. H. acknowledge the financial support of the UK EPSRC Grant No. EP/K034480/1. A. S. C. acknowledges the support of the CNPq-Brazil.
KeyWords: Quantum computers; Quantum optics, Amount of information; Building blockes; Coherent superpositions; Continuous variables; Experimental parameters; Infinite dimensional; Quantum-information processing; Quantum-state engineering, Quantum theory
DOI: 10.1103/PhysRevLett.116.110501

Citations: 17
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