Colangelo, G.; Martin Ciurana, F.; Puentes, G.; Mitchell, M.W.; Sewell, R.J."Entanglement-Enhanced Phase Estimation without Prior Phase Information" (2017) Physical Review Letters. 118(23)
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We study the generation of planar quantum squeezed (PQS) states by quantum nondemolition (QND) measurement of an ensemble of Rb87 atoms with a Poisson distributed atom number. Precise calibration of the QND measurement allows us to infer the conditional covariance matrix describing the Fy and Fz components of the PQS states, revealing the dual squeezing characteristic of PQS states. PQS states have been proposed for single-shot phase estimation without prior knowledge of the likely values of the phase. We show that for an arbitrary phase, the generated PQS states can give a metrological advantage of at least 3.1 dB relative to classical states. The PQS state also beats, for most phase angles, single-component-squeezed states generated by QND measurement with the same resources and atom number statistics. Using spin squeezing inequalities, we show that spin-spin entanglement is responsible for the metrological advantage. © 2017 American Physical Society.


Documento: Artículo
Título:Entanglement-Enhanced Phase Estimation without Prior Phase Information
Autor:Colangelo, G.; Martin Ciurana, F.; Puentes, G.; Mitchell, M.W.; Sewell, R.J.
Filiación:ICFO-Institut de Ciencies Fotoniques, Barcelona Institute of Science and Technology, Castelldefels (Barcelona), 08860, Spain
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Pabellón 1, Ciudad Universitaria, Buenos Aires, 1428, Argentina
ICREA - Institució Catalana de Recerca i Estudis Avanćats, Barcelona, 08015, Spain
Palabras clave:Atoms; Covariance matrix; Phase estimation; Phase information; Prior knowledge; QND measurements; Quantum nondemolition measurements; Single components; Spin squeezing inequalities; Squeezed state; Quantum theory
Título revista:Physical Review Letters
Título revista abreviado:Phys Rev Lett


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---------- APA ----------
Colangelo, G., Martin Ciurana, F., Puentes, G., Mitchell, M.W. & Sewell, R.J. (2017) . Entanglement-Enhanced Phase Estimation without Prior Phase Information. Physical Review Letters, 118(23).
---------- CHICAGO ----------
Colangelo, G., Martin Ciurana, F., Puentes, G., Mitchell, M.W., Sewell, R.J. "Entanglement-Enhanced Phase Estimation without Prior Phase Information" . Physical Review Letters 118, no. 23 (2017).
---------- MLA ----------
Colangelo, G., Martin Ciurana, F., Puentes, G., Mitchell, M.W., Sewell, R.J. "Entanglement-Enhanced Phase Estimation without Prior Phase Information" . Physical Review Letters, vol. 118, no. 23, 2017.
---------- VANCOUVER ----------
Colangelo, G., Martin Ciurana, F., Puentes, G., Mitchell, M.W., Sewell, R.J. Entanglement-Enhanced Phase Estimation without Prior Phase Information. Phys Rev Lett. 2017;118(23).