A Trilogy of Trifles for Quantum Technology
Lu J. Sham
Department of Physics, University of California San Diego
The trilogy of issues for quantum technology is the preservation of
quantum superposition, the measurement of a single quantum object, and
the control of the same. I hope that these trifles in the optical
control of electron spin in a quantum dot may, nonetheless, be of more
general use.
1. How an electron loses its coherence and rescued by
the Maxwell Angel.
2. How a continuous weak optical measurement of an
electron spin produces a random sequence of data and sheds light on the
electron spin dynamics.
3. How the precision of a small angle rotation of the
spin can limit scalability and be implemented by imitating practices in
classical computation.