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: Ist Nazl Ott INO CNR, Largo E Fermi 6, I-50125 Florence, Italy; Univ Florence, LENS, I-50019 Florence, Italy; Univ Florence, Dept Phys, I-50019 Florence, Italy; Univ London Imperial Coll Sci Technol & Med, Blackett Lab, QOLS, Prince Consort Rd, London SW7 2AZ, England; Ctr Univ UNINOVAFAPI, Dept Engn, BR-64073505 Teresina, Piaui, 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.

Journal/Review: PHYSICAL REVIEW LETTERS

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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