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Robust quantum parameter estimation: coherent magnetometry with feedback
John K. Stockton, JM Geremia, Andrew C. Doherty +1
We describe the formalism for optimally estimating and controlling both the state of a spin ensemble and a scalar magnetic field with information obtained from a continuous quantum…
A complete family of separability criteria
Andrew C. Doherty, Pablo A. Parrilo, Federico M. Spedalieri
We introduce a new family of separability criteria that are based on the existence of extensions of a bipartite quantum state to a larger number of parties satisfying certain s…
A Quantum Non-demolition measurement of Fock states of mesoscopic mechanical oscillators
D. H. Santamore, A. C. Doherty, M. C. Cross
We investigate a scheme that makes a quantum non-demolition measurement of the excitation level of a mesoscopic mechanical oscillator by utilizing the anharmonic coupling between t…
Quantum Kalman Filtering and the Heisenberg Limit in Atomic Magnetometry
JM Geremia, John K. Stockton, Andrew C. Doherty +1
The shot-noise detection limit in current high-precision atomic magnetometry is a manifestation of quantum fluctuations that scale as the square root of N in an ensemble of N parti…