ABSTRACT:
I will provide an introduction to the emerging field of
spintronics and spin qubits in this talk. Active control of carrier spin in
nanostructures of semiconductors and other electronic materials is projected
to lead to new device functionalities in the future. In particular, it may
be possible to envision memory and logic operations being carried out on the
same 'spintronic' chip. I will discuss various aspects of fundamental
physics related to this new research area of spin electronics with the
particular emphasis on localized electron spins in semiconductor
nanostructures, such as GaAs quantum dots and P donors in Si. A
revolutionary possibility in the (perhaps, far) future is using the natural
twolevel quantum dynamics of electron spin to create robust quantum bits
('qubits') which could be used to carry out solid state quantum information
processing or quantum computation. I will discuss in details the questions
of entanglement, decoherence, quantum error correction, and quantum gates in
semiconductor nanostructurebased solid state spin quantum computer
architectures, critically discussing from a theoretical perspective the
current status of the field and the prospects for carrying out largescale
quantum computation using solid state spin qubits. Aspects of fundamental
spin physics in the solid state environment will be emphasized in this talk.
This research has been supported by LPS, ARDA, NSA, ARO, DARPA, ONR, and
Please see http://www.physics.umd.edu/cmtc for the relevant publications.
