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Your search keyword '"Datta, Animesh"' showing total 21 results
Start Over Author "Datta, Animesh" Journal physical review letters
21 results on '"Datta, Animesh"'

18. Precision Metrology Using Weak Measurements.

Author

Lijian Zhang, Datta, Animesh, and Walmsley, Ian A.

Subjects
*ACCURACY, *METROLOGY, *HEISENBERG model, *PROBABILITY theory, *MEASUREMENT
Abstract

Weak values and measurements have been proposed as a means to achieve dramatic enhancements in metrology based on the greatly increased range of possible measurement outcomes. Unfortunately, the very large values of measurement outcomes occur with highly suppressed probabilities. This raises three vital questions in weak-measurement-based metrology. Namely, (Ql) Does post-selection enhance the measurement precision? (Q2) Does weak measurement offer better precision than strong measurement? (Q3) Is it possible to beat the standard quantum limit or to achieve the Heisenberg limit with weak measurement using only classical resources? We analyze these questions for two prototypical, and generic, measurement protocols and show that while the answers to the first two questions are negative for both protocols, the answer to the last is affirmative for measurements with phase-space interactions, and negative for configuration space interactions. Our results, particularly the ability of weak measurements to perform at par with strong measurements in some cases, are instructive for the design of weak-measurement-based protocols for quantum metrology. [ABSTRACT FROM AUTHOR]

Published
2015
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19. Approaching Quantum-Limited Metrology with Imperfect Detectors by Using Weak-Value Amplification.

Author

Liang Xu, Zexuan Liu, Datta, Animesh, Knee, George C., Lundeen, Jeff S., Yan-qing Lu, and Lijian Zhang

Subjects
*METROLOGY, *DETECTORS, *LIGHT intensity, *PHOTODETECTORS, *PHOTOBIOLOGY
Abstract

Weak-value amplification (WVA) is a metrological protocol that amplifies ultrasmall physical effects. However, the amplified outcomes necessarily occur with highly suppressed probabilities, leading to the extensive debate on whether the overall measurement precision is improved in comparison to that of conventional measurement (CM). Here, we experimentally demonstrate the unambiguous advantages of WVA that overcome practical limitations including noise and saturation of photodetection and maintain a shot-noise-scaling precision for a large range of input light intensity well beyond the dynamic range of the photodetector. The precision achieved by WVA is 6 times higher than that of CM in our setup. Our results clear the way for the widespread use of WVA in applications involving the measurement of small signals including precision metrology and commercial sensors. [ABSTRACT FROM AUTHOR]

Published
2020
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20. Optimal Measurements for Simultaneous Quantum Estimation of Multiple Phases

Author

Fabio Sciarrino, Peter C. Humphreys, Marco Barbieri, Augusto Smerzi, Animesh Datta, Mario A. Ciampini, Luca Pezzè, Ian A. Walmsley, Nicolò Spagnolo, Pezzè, Luca, Ciampini, Mario A., Spagnolo, Nicolò, Humphreys, Peter C., Datta, Animesh, Walmsley, Ian A., Barbieri, Marco, Sciarrino, Fabio, and Smerzi, Augusto

Subjects
Quantum Physics, Photon, Computer science, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, 010305 fluids & plasmas, 3. Good health, Physics and Astronomy (all), Matrix (mathematics), 0103 physical sciences, Key (cryptography), Quantum metrology, Statistical physics, Sensitivity (control systems), Quantum Physics (quant-ph), 010306 general physics, Communications protocol, Quantum, QC, Quantum computer
Abstract

A quantum theory of multiphase estimation is crucial for quantum-enhanced sensing and imaging and may link quantum metrology to more complex quantum computation and communication protocols. In this letter we tackle one of the key difficulties of multiphase estimation: obtaining a measurement which saturates the fundamental sensitivity bounds. We derive necessary and sufficient conditions for projective measurements acting on pure states to saturate the maximal theoretical bound on precision given by the quantum Fisher information matrix. We apply our theory to the specific example of interferometric phase estimation using photon number measurements, a convenient choice in the laboratory. Our results thus introduce concepts and methods relevant to the future theoretical and experimental development of multiparameter estimation., 4 pages + appendix, 2 figures

Published
2017

21. Quantum enhanced multiple phase estimation

Author

Marco Barbieri, Animesh Datta, Ian A. Walmsley, Peter C. Humphreys, Humphreys Peter, C., Barbieri, Marco, Datta, Animesh, and Walmsley Ian, A.

Subjects
Estimation, Physics, Quantum Physics, Discretization, Detector, Phase (waves), FOS: Physical sciences, General Physics and Astronomy, Variance (accounting), 01 natural sciences, 010305 fluids & plasmas, 0103 physical sciences, Quantum phase estimation algorithm, Limit (mathematics), Statistical physics, Quantum Physics (quant-ph), 010306 general physics, Quantum
Abstract

We study the simultaneous estimation of multiple phases as a discretised model for the imaging of a phase object. We identify quantum probe states that provide an enhancement compared to the best quantum scheme for the estimation of each individual phase separately, as well as improvements over classical strategies. Our strategy provides an advantage in the variance of the estimation over individual quantum estimation schemes that scales as O(d) where d is the number of phases. Finally, we study the attainability of this limit using realistic probes and photon-number-resolving detectors. This is a problem in which an intrinsic advantage is derived from the estimation of multiple parameters simultaneously., Accepted by Physical Review Letters

Published
2013

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