New spectroscopic frontiers
Article Abstract:
Squeezed light provides a new form of spectroscopy that diminishes noise levels below the quantum limit, an advantage never achieved by laser-based spectroscopy. E.S. Polzik and colleagues developed this new spectroscopic method in two steps: the first relies on squeezed light's ability to minimize quantum noise, while the second depends on enhancing the signal-to-noise ratio by producing squeezed light with lessened intensity fluctuations. The new method has other advantages such as increasing interferometers' sensitivity.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Quantum cryptography on multi-user optical fibre networks
Article Abstract:
Quantum cryptography using quantum mechanical processes to establish decryption keys allows detection of eavesdropping during message transmission due to an unavoidable and detectable disturbance in the received key information when there is eavesdropping. The use of quantum mechanical processes will allow a single controller on the network to establish and regularly update a distinct secret key with each network user. The keys can then be used to encrypt conventional data transmissions that are sent over the network.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Turning on quantum taps
Article Abstract:
The problem of measuring a quantum-mechanical observable without demolishig the original quantum state of the system while allowing future measurements has been circumvented. A method for tapping off information on the state of a laser beam without changing the signal has been developed. It functions through the nonlinear optical effect of cross-phase modulation. Optical quantum non-demolition measurements allow the approach to ideal quantum measurements.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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