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Title: Magnetic field sensing beyond the standard quantum limit using 10-spin noon states
Authors: Jones, J.A.
Karlen, S.D.
Fitzsimons, J.
Ardavan, A.
Benjamin, S.C. 
Briggs, G.A.D.
Morton, J.J.L.
Issue Date: 29-May-2009
Source: Jones, J.A., Karlen, S.D., Fitzsimons, J., Ardavan, A., Benjamin, S.C., Briggs, G.A.D., Morton, J.J.L. (2009-05-29). Magnetic field sensing beyond the standard quantum limit using 10-spin noon states. Science 324 (5931) : 1166-1168. ScholarBank@NUS Repository.
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.
Source Title: Science
ISSN: 00368075
DOI: 10.1126/science.1170730
Appears in Collections:Staff Publications

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