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SUMMARY:Influence of gravity on atomic interferometers - Jeremiah Mitchell
 \, University of Cambridge
DTSTART:20250225T110000Z
DTEND:20250225T120000Z
UID:TALK227551@talks.cam.ac.uk
CONTACT:Dr. Aashaq Shah
DESCRIPTION:Atom interferometers employ precise manipulation of the quantu
 m states of ultracold atom ensembles to probe field variations between the
  “arms" of the interferometer. The phase of the quantum states continual
 ly evolves and accumulates while the atoms interact with laser light pulse
 s used as the interferometer optics and while in free-fall propagation bet
 ween light pulses. Quantum interference of the atomic matter-waves encodes
  these fluctuations in the population difference of the quantum states of 
 the ensemble. The leading order phase shift arises from the coupling of th
 e atom acceleration to the natural frequency of the atomic states. For thi
 s reason atom interferometers have been built to be precise gravimeters an
 d inertial sensors finding use in tests of Newtons’s constant and the Ei
 nstein equivalence principle. They may also serve as a test bed for other 
 precise tests of gravity.\n\nThe AION and MAGIS collaborations will utiliz
 e this quantum technology in a gradiometer configuration to test fundament
 al physics and search for ultralight dark matter and gravitational waves i
 n the decihertz frequency range (0.1–1 Hz). In this talk I will develop 
 the influence of a semiclassical space and time dependent Newtonian gravit
 ational field on atom interferometers and demonstrate the potential noise 
 sources long-baseline instruments will come up against. I will also discus
 s future prospects for relativistic and non-classical tests of gravity wit
 h these extremely sensitive sensors.
LOCATION:Ryle Seminar Room
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