Prof Jonathan Jones: Publications

Spin-selective reactions of radical pairs act as quantum measurements

ArXiv 1002.2377 (2010)

Authors:

Jonathan A Jones, Peter J Hore

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

Authors:

Stephanie Simmons, Jonathan A Jones, Steven D Karlen, Arzhang Ardavan, John JL Morton

Preparing pseudopure states with controlled-transfer gates

PHYSICAL REVIEW A 82:3 (2010) ARTN 032315

Authors:

Minaru Kawamura, Benjamin Rowland, Jonathan A Jones

Magnetic field sensors using 13-spin cat states

(2009)

Authors:

Stephanie Simmons, Jonathan A Jones, Steven D Karlen, Arzhang Ardavan, John JL Morton

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.

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