Quantum Information and Entanglement

Our group takes both experimental and theoretical interest in quantum information processing. We experimentally develop quantum registers in the form of large arrays of magnetic microtraps. These are loaded with ultrcold atoms on a magnetic-film atom chip. Cheshire cat Another experiment aims at quantum information processing using cold Rydberg atoms. We theoretically investigate a modified version of Grover's quantum search algorithm that works well in the presence of spontaneous qubit decay. We have also explored classical-wave analogies of quantum information, both theoretically and experimentally, included a Fourier optics experiment implementing a quantum search.

Papers - Presentations


  1. R.J.C. Spreeuw and T.W. Hijmans,
    Robust quantum searching with spontaneously decaying qubits,
    Phys. Rev. A 76, 022306 (2007) [pdf, 116 kB]

  2. T.W. Hijmans, T.N. Huussen, and R.J.C. Spreeuw,
    Time and frequency domain solutions in an optical analogue of Grover's search algorithm,
    J. Opt. Soc. Am. B 24, 214-220 (2007) [pdf, 361 kB]

  3. N. Bhattacharya, H. B. van Linden van den Heuvell and R. J. C. Spreeuw,
    Implementation of quantum search algorithm using classical Fourier optics,
    Phys. Rev. Lett. 88, 137901 (2002) [pdf, 112 kB]

  4. Robert J.C. Spreeuw en Nandini Bhattacharya,
    Een speld in een hooiberg,
    Ned. Tijdschr. voor Natuurk. 68/8, 278-281 (2002) [proofs, pdf, 195 kB]

  5. R.J.C. Spreeuw,
    Classical wave-optics analogy of quantum information processing,
    Phys. Rev. A 63, 062302-1/8 (2001) [pdf, 477 kB]

  6. R.J.C. Spreeuw,
    A classical analogy of entanglement,
    Found. Phys. 28, 361-374 (1998) [ps, 189 kB].

  7. R.J.C. Spreeuw,
    Waarom de kat van Schrödinger óf leeft, óf niet,
    Ned. Tijdschr. voor Natuurk. 62/16, 343-344 (1996) [ps, 153 kB].

Selected presentations

  1. Filling a Quantum Box of Tricks,
    R. Spreeuw at the "SV Marie Curie lustrumsymposium", Nijmegen, 14 Nov. 2007.

  2. Quantum searching with spontaneously decaying qubits,
    R. Spreeuw at the International Conference on Quantum Information, Rochester NY, USA, June 2007.

  3. Robust Quantum Searching Using Spontaneous Decay; Simulation With Polynomial Resources,
    by R. Spreeuw at the Central Institute for Applied Mathematics, Forschungszentrum Juelich , 12 Oct 2006

  4. Quantum Search Using Local Relaxation; Simulation With Polynomial Resources,
    Invited talk by R. Spreeuw at CCFP'2006, Nizhnyi Novgorod, 2 July 2006

  5. Implementation of a Quantum Search Algorithm using Classical Fourier Optics,
    Invited talk by R. Spreeuw at the IX International Conference on Quantum Optics 2002,
    Raubichi, Belarus, 14-17 May, 2002.

  6. Finding a Needle in a Haystack with Classical-Wave Optics,
    Invited talk by R. Spreeuw at the European Research Conference on Quantum Optics,
    Sant Feliu de Guixols, Spain, 6-10 October 2001.