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      Magnetic Field Sensing Beyond the Standard Quantum Limit Using 10-Spin NOON States

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          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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          Discussion of Probability Relations between Separated Systems

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            Author and article information

            Journal
            Science
            Science
            American Association for the Advancement of Science (AAAS)
            0036-8075
            1095-9203
            May 28 2009
            May 29 2009
            April 23 2009
            May 29 2009
            : 324
            : 5931
            : 1166-1168
            Article
            10.1126/science.1170730
            19389997
            32762955-bf8e-4828-a2d8-bf76a27094e2
            © 2009
            History

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