Quantum Information and Device Theory

We tackle problems in the physics of quantum information device components and in the general theory of quantum computation. Examples of our research include: the design of superconducting and semiconducting qubits and associated decoherence effects; ground state and adiabatic quantum computation; dynamical decoupling; tests of quantumness; verification of quantum information processors; and quantum-enhanced devices.  We particularly value collaborations with experimentalists. We are continually looking for graduate students and postdoctoral fellows.

Research Highlights

Single spin readout in a semiconductor quantum dot with integrated rf-SET


Solid-light: quantum many body photon devices [above image]


High-fidelity gates for a persistent-current superconducting qubit

Quantum error correction and fault-tolerant
quantum computing



Ground state quantum computing



References:

M. M. Wilde and A. Mizel, Addressing the clumsiness loophole in a Leggett-Garg test of macrorealism, arXiv:1001.1777

R. Li and F. Gaitan, High fidelity universal quantum gates through group-symmetrized
rapid passage, Quantum Information and Computation 10, 936 (2010).

F. Gaitan and F. Nori, Density functional theory and quantum computing, Phys. Rev. B
79, 205117 (2009).

F. Gaitan, Quantum Error Correction and Fault-Tolerant Quantum Computing
(Taylor&Francis/CRC Press 2008).

A.D. GREENTREE, C. TAHAN, J.H. COLE, and L.C.L. HOLLENBERG, Quantum phase transitions of light Nature Physics 2, 856 - 861 (December, 2006)

M. FRIESEN, C. TAHAN, R. JOYNT, and M.A. ERIKSSON, Spin readout and initialization in a semiconductor quantum dot, Phys. Rev. Lett. 92, 037901 (2004)

A. Mizel and D. Lidar, Three and four-body interactions in spin-based quantum computers, Phys. Rev. Lett. 92, 077903 (2004).

C. TAHAN, M. FRIESEN, and R. JOYNT, Decoherence of electron spins in Si-based quantum computers,
Phys. Rev. B 66, 035314 (2002)

A. Mizel, M. W. Mitchell, and M. L. Cohen, Energy Barrier to Decoherence, Phys. Rev. A. Rapid Comm. 63, 40302 (2001).