Events in Physics
Thursday, November 03, 2016
-Export as iCalendar |
PS1.28
Quantum limits of laser interferometric gravitational-wave detectorsCurrent ground-based gravitational-wave detectors, e.g., Advanced LIGO, are kilometre scale Michelson-type laser interferometers with kilogram mirror-endowed test masses. Even though they are macroscopic in size, quantum mechanics plays an important role in determining their sensitivity. In particular, quantum fluctuation of the optical field not only sets the measurement imprecision in terms of shot noise, but also induces quantum back action noise that perturbs the motion of test masses. The trade-off between these two types of quantum noise gives rise to the so-called Standard Quantum Limit (SQL). For the first part of this talk, we will walk through different approaches to surpassing the SQL, which leads to a more stringent sensitivity limit---the Fundamental Quantum Limit (FQL). For the second part, we will present current understanding of the FQL and its implications for enhancing detector sensitivity. The discussions here are not limited to gravitational-wave detectors, and can be applied to general linear quantum measurement devices. References: for the first part and for the second. |
Export as iCalendar |
The Science and Technology Facilities Council invites applications for its public engagement large awards scheme. This supports projects that are expected to have a significant regional or national impact relevant to publicising engagement or teaching about the council’s science and technology areas, namely: •particle physics; •nuclear physics; •space, solar and planetary science; •astronomy; •astrophysics; •cosmology; •studying materials with muon and neutron sources; •studying materials with synchrotron light sources; •research using laser facilities. Anyone may apply, but project teams must have strong links with the council’s scientific research community. Partnerships that positively impact on the success of the project such as universities with science centres are encouraged to apply. Awards are worth between £10,000 and £100,000 each.
|