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SUMMARY:Ultracold RbCs Molecules: Robust Storage Qubits and Rotationally M
 agic Traps - Prof  Simon L. Cornish\, Department of Physics\, Durham Unive
 rsity
DTSTART:20221101T110000Z
DTEND:20221101T123000Z
UID:TALK192227@talks.cam.ac.uk
CONTACT:Moumita Das
DESCRIPTION:Ultracold polar molecules offer many exciting opportunities in
  the fields of quantum computation\, quantum simulation\nand fundamental s
 tudies of quantum matter. Many of these applications utilize the rotationa
 l states of the\nmolecule and rely on long rotational coherence times. Ach
 ieving this in experiments has so far proved challenging\,\nhowever\, owin
 g to the presence of large differential light shifts between rotational le
 vels that result from the\nanisotropic molecular polarizability. We explor
 e these light shifts using RbCs molecules confined in an optical\ntrap. We
  use precision microwave spectroscopy of the rotational transition to prob
 e the AC Stark shifts in the trap\nand reveal a rich energy structure with
  many avoided crossings between hyperfine states. We show that hyperfine\n
 states in the rotational ground state may be used to engineer robust stora
 ge qubits in the molecules and using\nRamsey interferometry demonstrate co
 herence times exceeding 5.6 s at the 95% confidence level. We\nthen show t
 hat similar coherence times should be achievable using a magic-wavelength 
 optical lattice\, where the\npolarizabilities are identical for two (or mo
 re) rotational states. We report the development of such a magic\ntrap at 
 a wavelength of 1146 nm. This wavelength lies between the X1Sigma to b3Pi 
 vibronic transitions\, allowing the\nanisotropic component of the polariza
 bility to be tuned to zero. We present spectroscopy of the X1Sigma to b3Pi
  transitions\nand show that the differential shift of the N = 0 to N = 1 r
 otational transition can be tuned to be zero in the\nmagic trap for a detu
 ning of approximately 185 GHz from the X1Sigma(v =0\;N =0) to b3Pi(v’ =0
 \;N’ =1) transition.\nFinally\, we will briefly describe ongoing experim
 ents to image and address single molecules in ordered arrays\nfor applicat
 ions in the field of quantum simulation\, including exciting new results o
 n the association of a single\nmolecule in optical tweezers.\n
LOCATION:Rutherford Seminar Room B (Room 980)
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