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High-Dimensional Single-Photon Quantum Gates: Concepts and Experiments

Babazadeh, Amin ; Erhard, Manuel ; Wang, Feiran ; Malik, Mehul ; Nouroozi, Rahman ; Krenn, Mario ; Zeilinger, Anton

Physical review letters, 03 November 2017, Vol.119(18), pp.180510 [Periódico revisado por pares]

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  • Título:
    High-Dimensional Single-Photon Quantum Gates: Concepts and Experiments
  • Autor: Babazadeh, Amin ; Erhard, Manuel ; Wang, Feiran ; Malik, Mehul ; Nouroozi, Rahman ; Krenn, Mario ; Zeilinger, Anton
  • Assuntos: Quantum Physics
  • É parte de: Physical review letters, 03 November 2017, Vol.119(18), pp.180510
  • Descrição: Transformations on quantum states form a basic building block of every quantum information system. From photonic polarization to two-level atoms, complete sets of quantum gates for a variety of qubit systems are well known. For multilevel quantum systems beyond qubits, the situation is more challenging. The orbital angular momentum modes of photons comprise one such high-dimensional system for which generation and measurement techniques are well studied. However, arbitrary transformations for such quantum states are not known. Here we experimentally demonstrate a four-dimensional generalization of the Pauli X gate and all of its integer powers on single photons carrying orbital angular momentum. Together with the well-known Z gate, this forms the first complete set of high-dimensional quantum gates implemented experimentally. The concept of the X gate is based on independent access to quantum states with different parities and can thus be generalized to other photonic degrees of freedom and potentially also to other quantum systems.
  • Idioma: Inglês

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