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Hari Dass, N. D.
- Three Results on Weak Measurements
Abstract Views :238 |
PDF Views:91
Authors
Affiliations
1 Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad 500 075, IN
1 Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad 500 075, IN
Source
Current Science, Vol 109, No 11 (2015), Pagination: 1965-1971Abstract
Three recent results on weak measurements are presented. They are: (i) repeated measurements on a single copy cannot provide any information on it and further, that in the limit of very large such measurements, weak measurements have exactly the same characteristics as strong measurements; (ii) the apparent non-invasiveness of weak measurements is illusory and they are no more advantageous than strong measurements even in the specific context of establishing Leggett-Garg inequalities, when errors are properly taken into account, and, finally, (iii) weak value measurements are optimal, in the precise sense of Wootters and Fields, when the post-selected states are mutually unbiased with respect to the eigenstates of the observable whose weak values are being measured. Notion of weak value coordinates for state spaces are introduced and elaborated.Keywords
Eigenstates, Non-Invasiveness, Projective and Weak Measurements, Quantum Mechanics, Single Copy.Full Text
References
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- Protective Measurements: Probing Single Quantum Systems
Abstract Views :216 |
PDF Views:74
Authors
Affiliations
1 Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi 110 025, IN
2 Centre for Interdisciplinary Sciences, 21 Brundavan Colony, Narsingi, Hyderabad 500 075, IN
1 Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi 110 025, IN
2 Centre for Interdisciplinary Sciences, 21 Brundavan Colony, Narsingi, Hyderabad 500 075, IN
Source
Current Science, Vol 109, No 11 (2015), Pagination: 2023-2028Abstract
Making measurements on single quantum systems is considered difficult, almost impossible if the state is a priori unknown. Protective measurements suggest a possiblity to measure single quantum systems and gain some new information in the process. Protective measurement is described here, both in the original and generalized form. The degree to which the system and the apparatus remain entangled in a protective measurement, is assessed. Possible exterimental tests of protective measurements are also discussed.Keywords
Expectation Value, Protective Measurements, Quantum Systems, Wavefunction Collapse.Full Text
References
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- Schlosshauer, M., State disturbance and pointer shift in protective quantum measurements. Phys. Rev. A, 2014, 90(5), 052106-1 to 052106-12.
- Hari Dass, N. D., Cold atoms for testing quantum mechanics and parity violation in gravitation. arXiv:quant-ph/9908085.
- Preface
Abstract Views :243 |
PDF Views:72
Authors
Source
Current Science, Vol 109, No 11 (2015), Pagination: 1935-1938Abstract
No Abstract.Full Text