Entanglement-free Heisenberg-limited phase estimation

B. L. Higgins, D. W. Berry, S. D. Bartlett, H. M. Wiseman and G. J. Pryde ()
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B. L. Higgins: Centre for Quantum Dynamics, Griffith University
D. W. Berry: Centre for Quantum Computer Technology, Macquarie University
S. D. Bartlett: School of Physics, University of Sydney
H. M. Wiseman: Centre for Quantum Dynamics, Griffith University
G. J. Pryde: Centre for Quantum Dynamics, Griffith University

Nature, 2007, vol. 450, issue 7168, 393-396

Abstract: Heisenberg's the limit At the fundamental level, measurement precision is limited by the number of quantum resources (such as photons) involved, and standard phase measurement schemes lead to an uncertainty (the standard quantum limit) that scales with this number. In theory, it should be possible to achieve a precision limited only by the Heisenberg uncertainty principle. A few experiments have beaten the standard quantum limit, but none have achieved Heisenberg-limited scaling until now, largely due to the need for difficult-to-generate exotic quantum entangled states. Higgins et al. adopted an alternative approach using unentangled single-photon states, allowing them to achieve Heisenberg-limited phase estimation. This marks a drastic reduction in the complexity of achieving quantum-enhanced measurement precision.

Date: 2007
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DOI: 10.1038/nature06257

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