Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Precision measurements and metrology IV

Q 62.5: Vortrag

Freitag, 21. März 2014, 15:15–15:30, DO24 1.101

Microwave Electrometry with Rydberg Atoms in a Vapor Cell — •Harald Kübler1,2, Jonathan A. Sedlacek1, Arne Schwettmann1, Renate Daschner2, Haoquan Fan1, Santosh Kumar1, Robert Löw2, Tilman Pfau2, and James P. Shaffer11Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, 440 W. Brooks St. Norman, Oklahoma 73019, USA — 25. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart Germany

Quantum based standards of length and time as well as measurements of other useful physical quantities, ex. magnetic fields, are important because quantum systems, like atoms, show clear advantages for providing stable and uniform measurements. We demonstrate a new method for measuring microwave electric fields based on quantum interference in a Rubidium atom. Using a bright resonance prepared within an electromagnetically induced transparency window we are able to achieve a sensitivity of 30 µV cm−1Hz−1 and demonstrate detection of microwave electric fields as small as ∼ 8 µV cm−1 with a modest setup [1]. This method can be used for vector electrometry with a precision below 1 [2]. We show first results on microwave field imaging with a sub-wavelength resolution.

[1] J.A. Sedlacek, et.al. "Quantum Assisted Electrometry using Bright Atomic Resonances" Nature Physics 8, 819 (2012)

[2] J.A. Sedlacek, et.al. "Atom-Based Vector Microwave Electrometry Using Rubidium Rydberg Atoms in a Vapor Cell" Phys. Rev. Lett. 111, 063001 (2013)

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