Fabrication and classical characterisation of an integrated optic controlled phase gate

T. Meany, D. N. Biggerstaff, A. Fedrizzi, M. A. Broome, M. Delanty, A. Gilchrist, M. J. Steel, A. G. White, M. J. Withford

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

Abstract

Optical quantum computing (QC) increasingly uses integrated optics based experiments which permit circuit compactness and phase stability [1]. However, despite the rapid adaptations of integrated waveguide devices for quantum photonics, initial gate demonstrations operate in post-selection, thus not allowing scaling of a quantum circuit beyond the depth of a single gate. Recently, a number of quantum circuits have been demonstrated using the femtosecond laser direct write (FLDW) technique [2]. This technique induces refractive index change in glass substrates which can form three-dimensional waveguide devices. Here we demonstrate a potentially scalable waveguide gate for QC, a controlled-phase gate or Knill gate, produced using the FLDW technique. This gate produces a phase shift on a target qubit conditional on the state of a control qubit, as shown in Fig. 1(a). It requires four photons for operation, two of which act as the target and control path-encoded qubits and two ancillas which herald the successful operation of the circuit [3].

Original languageEnglish
Title of host publication2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1-1
Number of pages1
ISBN (Electronic)9781479905942 , 9781479905935
ISBN (Print)9781479905928
DOIs
Publication statusPublished - 2013
Event2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 - Munich, Germany
Duration: 12 May 201316 May 2013

Other

Other2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013
CountryGermany
CityMunich
Period12/05/1316/05/13

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