Hannover 2020 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 13: Posters: Quantum Optics and Photonics I

Q 13.24: Poster

Montag, 9. März 2020, 16:30–18:30, Empore Lichthof

Highly dynamical microwave source with low phase noise for cold atom experiments — •Bernd Meyer, Alexander Idel, Fabian Anders, and Carsten Klempt — Institut für Quantenoptik, Leibniz Universität Hannover

Entangled states in Bose-Einstein condensates (BECs) can be employed for precision metrology and for exploring fundamental physics. The generation of entanglement can be achieved by spin-changing collisions in a spinor Bose-Einstein condensate. This process allows for the creation of pair correlations and full many-particle entanglement within the atomic ensemble. [1]

The preparation of the initial states and the manipulation of the entangled states require the application of tailored microwave fields. The fidelity of the created states is often limited by microwave phase noise. In an atom interferometer, this noise generally deteriorates the interferometric signal. Reduction of the microwave’s phase noise is thus crucial for high-precision measurements at the shot noise level.

We will present a novel microwave source based on FPGA-controlled Direct Digital Synthesis (DDS). The source offers adjustable frequency, phase and amplitude with update times of only 700 ns. When using RAM of the DDS, shaped pulses with different parameters can be applied. The resulting phase noise is in the range of -125 dBc/Hz to -130 dBc/Hz for offset frequencies of 20 kHz to 20 MHz.

[1] B. Lücke et al., Phys. Rev. Lett., 112, 155304 (2014).