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Radu Ionicioiu
Research Fellow

E-mail: radu.ionicioiu@hp.com
Phone: +44 (0)117 312 9984
FAX: +44 (0)117 312 9870

Quantum Information Processing Group
Hewlett-Packard Laboratories, Bristol

Radu graduated in 1991 with an MSc from University of Bucharest (Romania). He obtained his PhD in 1999 (Cambridge, UK) with a thesis investigating topology change in 3-dimensional quantum gravity. His interest in the newly emerging field of quantum computation was stimulated by the existence of an undecidable problem in quantum gravity (4-manifolds are unclassifiable) and by the natural question if this would be solvable on a quantum computer (the answer, disappointingly, turned out to be negative).

Before joining HP Labs in January 2007, Radu held postdoctoral positions at the Institute for Scientific Interchange (ISI), Torino (2000-6), and in the Engineering Department, Cambridge (1999-2000).

Research interests

  • solid-state implementations of QIP, spintronic devices
  • cluster state/measurement based QIP
  • entanglement in highly correlated spin systems, Kitaev model, topological gates
  • new technologies for optical QIP


  1. M. Cozzini, R. Ionicioiu, P. Zanardi, Quantum fidelity and quantum phase transitions in matrix product states, cond-mat/0611727.
  2. R. Ionicioiu, Entangling spins by measuring charge: a parity-gate toolbox; quant-ph/0609118.
  3. R. Ionicioiu, The parity gate: from quantum networks to entanglement generation, Int. J. Quantum Information (2006, to appear).
  4. R. Ionicioiu, Spintronic devices as quantum networks, Laser Physics 16, 1444 (2006), Special Issue on Quantum Information; quant-ph/0512116.
  5. A. Hamma, R. Ionicioiu, P. Zanardi, Quantum entanglement in states generated by bilocal group algebras, Phys. Rev. A 72, 012324 (2005); quant-ph/0504049.
  6. A. Hamma, R. Ionicioiu, P. Zanardi, Bipartite entanglement and entropic boundary law in lattice spin systems, Phys. Rev. A 71, 022315 (2005); quant-ph/0409073.
  7. A. Hamma, R. Ionicioiu, P. Zanardi, Ground state entanglement and geometric entropy in the Kitaev’s model, Phys. Lett. A 337, 22 (2005); quant-ph/0406202.
  8. R. Ionicioiu, A.E. Popescu, Single spin measurement using spin-orbital entanglement, New J. Phys. 7, 120 (2005); quant-ph/0310047.
  9. A.E. Popescu, R. Ionicioiu, All-Electrical Quantum Computation with Mobile Spin Qubits, Phys. Rev. B 69, 245422 (2004); cond-mat/0306401.
  10. R. Ionicioiu, I. D’Amico, An interferometric spin-polarizing device, Semiconductor Science and Technology 19, S418 (2004).
  11. R. Ionicioiu, Quantum gates with topological phases, Phys. Rev. A 68, 034305 (2003); quant-ph/0304199.
  12. R. Ionicioiu, I. D’Amico, Mesoscopic Stern-Gerlach device to polarize spin currents, Phys. Rev. B 67, 041307(R) (2003); cond-mat/0207533.
  13. R. Ionicioiu, P. Zanardi, Quantum information processing in bosonic lattices, Phys. Rev. A 66,
    050301(R) (2002); quant-ph/0204118.
  14. A. Bertoni, R. Ionicioiu, P. Zanardi, F. Rossi and C. Jacoboni, Simulation of entangled electronic states in semiconductor quantum wires, Physica B 314, 10 (2002).
  15. P. Zanardi, I. D’Amico, R. Ionicioiu, E. Pazy, E. Biolatti, R. C.
    Iotti, and F. Rossi, Quantum information processing using semiconductor nanostructures, Physica B 314, 1 (2002).
  16. F. Rossi, E. Biolatti, R. C. Iotti, I. D’Amico, R. Ionicioiu, E.
    Pazy, and P. Zanardi, Entanglement of
    excitonic states and quantum information processing in semiconductors, Physica Status Solidi 190,
    817 (2002).
  17. E. Biolatti, I. D’Amico, R. Ionicioiu, P. Zanardi, and F. Rossi, Ultrafast Quantum Information Processing in Nanostructured Semiconductors, Superlattices and Microstructures 31,
    107 (2002).
  18. R. Ionicioiu, P. Zanardi, and F. Rossi, Testing Bell’s Inequality with Ballistic Electrons in Semiconductors, Phys. Rev. A 63, 050101(R) (2001); quant-ph/0009026.
  19. R. Ionicioiu, G. Amaratunga, and F. Udrea, Quantum Computation with Ballistic Electrons, International Journal of Modern Physics B 15, 125 (2001); quant-ph/0011051.
  20. R. Ionicioiu, Amplitudes for topology change in Turaev-Viro theory, Classical and Quantum Gravity 15, 1885 (1998).
  21. R. Ionicioiu and R. M. Williams, Lens Spaces and Handlebodies in 3D Quantum Gravity, Classical and Quantum Gravity 15, 3469 (1998); gr-qc/9806027.
  22. R. Ionicioiu, On a periodic iterative mapping (in Romanian), Rev.
    Rom. Informatica & Automatica,
    vol. 3, no. 3, 71 (1993).




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