Published in New Journal of Physics: Demonstrating Heisenberg-limited unambiguous phase estimation without adaptive measurements

Following up our previous publication, here we theoretically prove and experimentally demonstrate a quantum control algorithm to measure an optical phase at the fundamental Heisenberg limit of precision without entangled states or adaptive mesurements. We also demonstrate a simplified adaptive protocol with accuracy surpassing standard techniques.

B. L. Higgins, D. W. Berry, S. D. Bartlett, M. W. Mitchell, H. M. Wiseman, and G. J. Pryde
New J. Phys. 11, 073023 (2009)

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