Quantum spin dynamics

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Magnetic field sensors using 13-spin cat states

(2009)

Authors:

Stephanie Simmons, Jonathan A Jones, Steven D Karlen, Arzhang Ardavan, John JL Morton
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Acuminated fluorescence of Er3 + centres in endohedral fullerenes through the incarceration of a carbide cluster

Chemical Physics Letters 476:1-3 (2009) 41-45

Authors:

SR Plant, G Dantelle, Y Ito, TC Ng, A Ardavan, H Shinohara, RA Taylor, GAD Briggs, K Porfyrakis

Abstract:

Photoluminescence spectroscopic measurements have allowed the acquisition of high resolution spectra at low temperature for the endohedral metallofullerenes, Er2 @ C82 (isomer I) and Er2 C2 @ C82 (isomer I). The characteristic emission in the 1.5-1.6 μm region corresponds to the 4 I13 / 2 (m) → 4 I15 / 2 (n) transitions of the Er3 + ion for both molecules. The emission arising from Er2 C2 @ C82 (I) appears acuminated (narrow lines that taper to a point) when compared with that of Er2 @ C82 (I). The Er2 C2 @ C82 (I) emission linewidths are comparable to those found in crystals, making this molecule of interest for applications where accessible, well-defined quantum states are required. © 2009 Elsevier B.V. All rights reserved.
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ChemInform Abstract: Synthesis of Fullerene Dimers with Controllable Length

ChemInform Wiley 40:23 (2009) no-no

Authors:

Kyriakos Porfyrakis, Mark R Sambrook, Timothy J Hingston, Jinying Zhang, Arzhang Ardavan, G Andrew D Briggs
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Anisotropic exchange in a tetranuclear CoII complex

Polyhedron Elsevier 28:9-10 (2009) 1922-1926

Authors:

Junjie Liu, Saiti Datta, Erica Bolin, Jon Lawrence, Christopher C Beedle, En-Che Yang, Philippe Goy, David N Hendrickson, Stephen Hill
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Magnetic field sensing beyond the standard quantum limit using 10-spin NOON states.

Science 324:5931 (2009) 1166-1168

Authors:

Jonathan A Jones, Steven D Karlen, Joseph Fitzsimons, Arzhang Ardavan, Simon C Benjamin, G Andrew D Briggs, John JL Morton

Abstract:

Quantum entangled states can be very delicate and easily perturbed by their external environment. This sensitivity can be harnessed in measurement technology to create a quantum sensor with a capability of outperforming conventional devices at a fundamental level. We compared the magnetic field sensitivity of a classical (unentangled) system with that of a 10-qubit entangled state, realized by nuclei in a highly symmetric molecule. We observed a 9.4-fold quantum enhancement in the sensitivity to an applied field for the entangled system and show that this spin-based approach can scale favorably as compared with approaches in which qubit loss is prevalent. This result demonstrates a method for practical quantum field sensing technology.
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