Phase diffusion in trapped-atom interferometers

Autor(es)

Ivannikov, Valentin ^{[1, 2, 3, 4]} ; Sidorov, Andrei I. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil

^[2] Swinburne Univ Technol, Ctr Quantum & Opt Sci, Melbourne, Vic - Australia

^[3] New York Univ Shanghai, Shanghai - Peoples R China

^[4] East China Normal Univ, State Key Lab Precis Spect, Sch Phys & Mat Sci, Shanghai - Peoples R China

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS; v. 51, n. 20 OCT 28 2018.
• Citações Web of Science: 0

Resumo

We evaluate the performance and phase diffusion of trapped Rb-87 atoms in an atom chip sensor with Ramsey interferometry and Hahn's spin echo in the time and phase domains. We trace out how the phase uncertainty of interference fringes grows with time. The phase-domain spin echo enables us to measure many-second-long phase diffusion with a low-cost local oscillator that otherwise seems unrealistic to obtain with such an oscillator. In the Ramsey experiment we record interference fringes with contrast decaying in 12 s, and with a frequency uncertainty of 80 mHz corresponding to the dephasing time of 2.8. s. A clear distinction is drawn between the decoherence of the atomic ensemble, and the dephasing originating from the local oscillator. Spin echo cancels most of the perturbations affecting the Ramsey experiments, and leaves the residual phase noise of only 19 mHz mostly attributed to the local oscillator frequency instability, yielding the increased coherence time of 11.9 s which coincides with the contrast decay time in the Ramsey sequence. A number of perturbation sources leading to homogeneous and inhomogeneous dephasing is discussed. Our atom chip sensor is useful in probing fundamental interactions, atomtronics, microcantilever, and resonant cavity profiling in situ. (AU)

• Processo FAPESP: 16/23874-4 - Estudo da interação entre átomos frios e ondas de luz evanescentes
• Beneficiário: Valentin Ivannikov
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado