Linear optical CNOT gate with orbital angular momentum and polarization

  • J. H. Lopes
  • W. C. Soares
  • Bertúlio de Lima Bernardo
  • D. P. Caetano
  • Askery CanabarroEmail author


It is well established in the theory of quantum computation that the controlled-NOT (CNOT) gate is a fundamental element in the construction of a quantum computer. Here, we propose and experimentally demonstrate within a classical light framework that a Mach–Zehnder interferometer composed of polarized beam splitters and a pentaprism in the place of one of the mirrors works as a linear optical quantum CNOT gate. To perform the information processing, the polarization and orbital angular momentum of light act as the control and target qubits, respectively. The readout process is simple, requiring only a linear polarizer and a triangular diffractive aperture prior to detection. The viability and stability of our experiment suggest that the present proposal is a valuable candidate for future implementations in optical quantum computation protocols.


CNOT gate Light polarization Angular orbital momentum 



AC thanks UFAL for a paid license for scientific cooperation at UFRN, MEC/UFRN for a fellowship and the Brazilian funding agency CNPQ Universal Grant No. 423713/2016-7. BLB received financial support CNPq, Grant No. 309292/2016-6. WCS acknowledges the Brazilian funding agencies CAPES, FAPEAL and INCT-IQ.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Grupo de Física da Matéria Condensada, Núcleo de Ciências Exatas - NCEx, Campus ArapiracaUniversidade Federal de AlagoasArapiracaBrazil
  2. 2.Departamento de FísicaUniversidade Federal de Santa CatarinaFlorianópolisBrazil
  3. 3.Departamento de FísicaUniversidade Federal de Campina GrandeCampina GrandeBrazil
  4. 4.Departamento de FísicaUniversidade Federal da ParaíbaJoão PessoaBrazil
  5. 5.Escola de Engenharia Industrial Metalúrgica de Volta RedondaUniversidade Federal FluminenseVolta RedondaBrazil
  6. 6.International Institute of PhysicsFederal University of Rio Grande do NorteNatalBrazil

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