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SUMMARY:Probing the Quantum Coherent Behaviour of Gravity - Sougato Bose
DTSTART:20181122T141500Z
DTEND:20181122T151500Z
UID:TALK113167@talks.cam.ac.uk
CONTACT:Johannes Bausch
DESCRIPTION:A lack of empirical evidence has lead to a debate on whether g
 ravity is a quantum entity.  Motivated by this\, I will present a feasible
  idea for such a test based on the principle that two objects cannot be en
 tangled without a quantum mediator. I will show that despite the weakness 
 of gravity\, the phase evolution induced by the gravitational interaction 
 of two micron size test masses in adjacent matter-wave interferometers can
  detectably entangle them even when they are placed far apart enough to ke
 ep Casimir-Polder forces at bay. A prescription for witnessing this entang
 lement\, which certifies gravity as a quantum coherent mediator\, is also 
 provided and can be measured through simple spin correlations.  As an adde
 ndum\, we will show that the type of matter wave interferometers with meso
 scopic masses that we have proposed are also of use in designing compact (
 meter scale) detectors for low frequency gravitational waves.
LOCATION:MR4\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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