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Single shot parameter estimation via continuous quantum measurement

Autor: Chase, Bradley A., Geremia, J. M.

Publikováno v: Phys. Rev. A 79, 022314 (2009)

We present filtering equations for single shot parameter estimation using continuous quantum measurement. By embedding parameter estimation in the standard quantum filtering formalism, we derive the optimal Bayesian filter for cases when the paramete

Externí odkaz: http://arxiv.org/abs/0811.0601

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Collective processes of an ensemble of spin-1/2 particles

Autor: Chase, Bradley A., Geremia, J. M.

Publikováno v: Phys. Rev. A 78, 052101 (2008)

When the dynamics of a spin ensemble are expressible solely in terms of symmetric processes and collective spin operators, the symmetric collective states of the ensemble are preserved. These many-body states, which are invariant under particle relab

Externí odkaz: http://arxiv.org/abs/0805.2911

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Collective States and Symmetric Local Decoherence in Large Ensembles of Qubits

Autor: Chase, Bradley A., Geremia, J. M.

The symmetric collective states of an atomic spin ensemble (i.e., many-body states that are invariant under particle exchange) are not preserved by decoherence that acts identically but individually on members of the ensemble. We develop a class of c

Externí odkaz: http://arxiv.org/abs/0805.2910

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Efficient feedback controllers for continuous-time quantum error correction

Autor: Chase, Bradley A., Landahl, Andrew J., Geremia, J. M.

Publikováno v: Phys. Rev. A 77, 032304 (2008)

We present an efficient approach to continuous-time quantum error correction that extends the low-dimensional quantum filtering methodology developed by van Handel and Mabuchi [quant-ph/0511221 (2005)] to include error recovery operations in the form

Externí odkaz: http://arxiv.org/abs/0711.0689

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Suppression of Spin Projection Noise in Broadband Atomic Magnetometry

Autor: Geremia, J. M., Stockton, John K., Mabuchi, Hideo

Our 2005 Physical Review Letter entitled "Suppression of Spin-Projection Noise in Broadband Atomic Magnetometry" (volume 94, 203002) relied heavily in its claims of experimental quantum-limited performance on the results of a prior publication from o

Externí odkaz: http://arxiv.org/abs/quant-ph/0401107

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