Spin-selective reactions of radical pairs act as quantum measurements
ArXiv 1002.2377 (2010)
Abstract:
Since the 1970s, spin-selective reactions of radical pairs have been modelled theoretically by adding phenomenological rate equations to the quantum mechanical equation of motion of the radical pair spin density matrix. Here, using a quantum measurement approach, we derive an alternative set of rate expressions which predict a faster decay of coherent superpositions of the singlet and triplet radical pair states. The difference between the two results, however, is not dramatic and would probably be difficult to distinguish experimentally from decoherence arising from other sources.Magnetic field sensors using 13-spin cat states
PHYSICAL REVIEW A 82:2 (2010) ARTN 022330
Preparing pseudopure states with controlled-transfer gates
PHYSICAL REVIEW A 82:3 (2010) ARTN 032315
Composite pulses in NMR quantum computation
Journal of the Indian Institute of Science 89:3 (2009) 303-308
Abstract:
I describe the use of techniques based on composite rotations to combat systematic errors in quantum logic gates. Although developed and described within the context of Nuclear Magnetic Resonance (NMR) quantum computing these sequences should be applicable to other implementations of quantum computation.Magnetic field sensing beyond the standard quantum limit using 10-spin NOON states.
Science 324:5931 (2009) 1166-1168