We report a measurement of the modification of the effective precession frequency of polarized 3 He atoms in response to a dressing field in a room temperature cell. The 3 He atoms were polarized using the metastability spin-exchange method. An oscillating dressing field is then applied perpendicular to the constant magnetic field. Modification of the 3 He effective precession frequency was observed over a broad range of the amplitude and frequency of the dressing field. The observed effects are compared with calculations based on quantum optics formalism.Key words: dressed spin; polarized 3 He; neutron EDM PACS: 11.30.Er,, 13.40.Em,, 21.10.Dk A non-zero neutron electric dipole moment(EDM) is direct evidence for violations of both parity (P ) and time-reversal (T ) symmetries [1,2]. Assuming CP T invariance, T violation also implies CP -violation [3]. Observation of a non-zero neutron EDM would provide qualitatively new information on the origin of CP -violation, since no CP violation has ever been found for a baryon or a hadron containing light quarks only, like a neutron.The most sensitive neutron EDM measurement was carried out at the ILL (Institut Laue Langevin) using bottled ultracold neutrons (UCNs) and an upper limit of |d n | < 2.9 × 10 −26 e cm (90% C.L.) was obtained [4]. A non-zero
We report a measurement of dressed-spin effects of polarized 3 He atoms from a cold atomic source traversing a region of constant magnetic field B0 and a transverse oscillatory dressing field B d cos ω d t.The observed effects are compared with a numerical simulation using the Bloch equation as well as a calculation based on the dressed-atom formalism. An application of the dressed spin of 3 He for a proposed neutron electric dipole moment measurement is also discussed.
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