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Unnikrishnan, C. S.
- Quantum Non-Demolition Measurements: Concepts, Theory and Practice
Abstract Views :221 |
PDF Views:102
Authors
Affiliations
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
Source
Current Science, Vol 109, No 11 (2015), Pagination: 2052-2060Abstract
This is a limited overview of quantum non-demolition (QND) measurements, with brief discussions of illustrative examples meant to clarify the essential features. In a QND measurement, the predictability of a subsequent value of a precisely measured observable is maintained and any random back-action from uncertainty introduced into a non-commuting observable is avoided. The fundamental ideas, relevant theory and the conditions and scope for applicability are discussed with some examples. Precision measurements have indeed gained from developing QND measurements and some implementations in quantum optics, gravitational wave detectors and spin-magnetometry are discussed.Keywords
Back-Action Evasion, Gravitational Waves, Quantum Non-Demolition, Standard Quantum Limit, Squeezed Light.Full Text
References
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- The LIGO Scientific Collaboration, Enhanced sensitivity of the LIGO gravitational wave detector by using squeezed states of light. Nature Photonics, 2013, 7(8), 613–619.
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- Double Bonanza at the LIGO Gravitational Wave Detectors
Abstract Views :287 |
PDF Views:70
Authors
Affiliations
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
Source
Current Science, Vol 110, No 7 (2016), Pagination: 1146-1152Abstract
Soon after the two advanced LIGO detectors were ready in September 2015 for a calibrated observation run, a giant gravitational wave burst hit the detectors and were duly recorded as nearly identical chirped signal wave spiralling up in frequency and amplitude from 35 to 250 Hz, with a relative delay of 6.9 ms, well inside the light travel distance of 10 ms between the two detectors. The peak strain amplitude touched 100 times the base sensitivity. Analysis of the 200 ms short event led to the robust conclusion that LIGO detectors saw gravitational waves from two orbiting and merging black holes of nearly 30 solar mass each, at a distance of about 1.3 billion light years. We sketch this double discovery of great scientific and astronomical importance - the terrestrial detection of gravitational waves, ushering in the era of gravitational wave astronomy, and the discovery of a stellar mass binary black hole system, observed during their orbital evolution towards merger and then to the formation of a single stable black hole, all invisible to any other form of astronomy.Full Text
- LIGO-India - A Unique Adventure in Indian Science
Abstract Views :232 |
PDF Views:86
Authors
Affiliations
1 Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007, IN
2 Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
3 Institute for Plasma Research, Bhat, Gandhinagar 382 428, IN
4 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
5 International Centre for Theoretical Sciences–TIFR, Hesaraghatta Hobli, Bengaluru 560 089, IN
1 Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007, IN
2 Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
3 Institute for Plasma Research, Bhat, Gandhinagar 382 428, IN
4 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
5 International Centre for Theoretical Sciences–TIFR, Hesaraghatta Hobli, Bengaluru 560 089, IN
Source
Current Science, Vol 113, No 04 (2017), Pagination: 672-677Abstract
LIGO-India is an ambitious, large scale mega-science project that will establish a state-of-the-art advanced LIGO gravitational wave (GW) observatory on Indian soil in collaboration with the LIGO Laboratory in the USA. LIGO-India is expected to commence science operations in 2024 as a key element of a global array of gravitational wave observatories. Beyond the first direct detection of gravitational waves announced in February 2016 by LIGO Science Collaboration, LIGO-India brings forth a great opportunity for Indian scientists and technologists for leadership at the frontier, a new window of gravitational-wave astronomy to probe the universe.Keywords
Astronomy and Astrophysics, Gravitational Waves, Layer Interferometer, Mega-Science Projects, Observatories and Detectors.Full Text
References
- Abbott, B. P. et al., Observation of gravitational waves from a binary black hole merger. (LIGO Scientific Collaboration and Virgo Collaboration). Phys. Rev. Lett., 2016, 116, 061102.
- http://www.ligo.org
- http://www.gw.iucaa.in/ligo-india/
- http://www.gw-indigo.org
- https://dcc.ligo.org/public/0075/M1100296/002/LIGO-India_lw-v2.pdf
- https://www.advancedligo.mit.edu
- It’s About Time: Understanding Einstein’s Relativity. N. David Mermin
Abstract Views :170 |
PDF Views:81
Authors
Affiliations
1 Department of High Energy Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, IN
1 Department of High Energy Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, IN
Source
Current Science, Vol 122, No 3 (2022), Pagination: 344-345Abstract
No Abstract.Keywords
No keywordsFull Text
- MACE Telescope
Abstract Views :90 |
PDF Views:51
Authors
Affiliations
1 School of Quantum Technology, Defence Institute of Advanced Technology (Defence Research and Development Organisation), Pune 411 025, IN
1 School of Quantum Technology, Defence Institute of Advanced Technology (Defence Research and Development Organisation), Pune 411 025, IN
Source
Current Science, Vol 124, No 12 (2023), Pagination: 1373-1373Abstract
No Abstract.Keywords
No Keywords.Full Text
References
- Yadav, K. K. et al., Curr. Sci., 2022, 123(12), 1428–1435.