Quantum spin dynamics

Research group

Research theme

Sub department

About

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.
More details from the publisher

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
More details from the publisher

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
More details from the publisher
More details

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.
More details from the publisher
More details
Details from ArXiV

Magnetic field sensing beyond the standard quantum limit using 10-spin noon states

Science 324:5931 (2009) 1166-1168

Authors:

JA Jones, SD Karlen, J Fitzsimons, A Ardavan, SC Benjamin, GAD Briggs, JJL 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 spinbased 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.
More details from the publisher