Superconducting Flux Qubits and Macroscopic Quantum Mechanics
Information about the PhD-research of Alexander ter Haar








See QuTech in Delft for the current state of Quantum Research and Quantum Computing.

Updated: december 2011, 2017 (repair broken links)


References about Macroscopic Quantum Mechanics :

Quantum mechanics versus macroscopic realism: Is the flux there when nobody looks?, A. J. Leggett and A. Garg (1985), Phys. Rev. Lett. 54 857
Probing quantum mechanics towards the every day world: where do we stand?, A.J. Legget (2002).
Simulating Physics with Computers, Richard P. Feynman (1982), International Journal of Theoretical Physics, Vol 21 (pdf)

Articles and websites about the Flux qubit research at QT of the past seven years:

Proposal for the Josephson Persistent Current Qubit (1999):
"Josephson Persistent-Current Qubit", J. E. Mooij, T. P. Orlando, L. Levitov, Lin Tian,Caspar H. van der Wal, Seth Lloyd, Phys. Rev. Lett. 54 857

Experimental evidence for superpositions of marcoscopic quantum states in fluxqubits (2000):
"Quantum Superpostition of Macroscopic Persistent-Current States", Caspar H. van der , Wal, A. C. J. ter Haar, F. K. Wilhelm, R. N. Schouten, C. J. P. M. Harmans,1 T. P. Orlando, Seth Lloyd, J. E. Mooij, Science (pdf)

Measurements of coherent dynamics (2003):
"Coherent Quantum Dynamics of a Superconducting Flux Qubit", I. Chiorescu, Y. Nakamura,C. J. P. M. Harmans,1 J. E. Mooij.

Coupling of fluxqubits (2005):
"Spectroscopy on Two Coupled Superconducting Flux Qubits", J. B. Majer, F. G. Paauw, A. C. J. ter Haar, C. J. P. M. Harmans, and J. E. Mooij, PRL (pdf)

Coherent operations on coupled qubits (2007):
"Demonstration of controlled-NOT quantum gates on a pair of superconducting quantum bits", J. H. Plantenberg, P. C. de Groot, C. J. P. M. Harmans & J. E. Mooij, Nature

Introduction to Flux Qubits from the QT homepage.

Research Groups:

QuTech Flux Qubit Team
Flux Qubit Team(local copy)
Superconducting Circuits and Quantum Computation group, MIT

Some links about physics and quantum computation

"There's Plenty of room at the bottom", famous talk by Richard Feynman in 1959 about miniaturization.
Introduction to strings

Some more links

'De kwantumcomputer, een onbegrijpelijk rekenwonder' (Dutch), Interview about quantum computation for the HCC, 2005
'Codes Kraken in de kou' (Dutch), Interview with Delft University paper Delta with Caspar and me about our superconducting Quantum Computing research, 2000 (Dutch)

Physical Review Letters
ArXiv (LANL)