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Proceedings Paper

0.75 atoms improve the clock signal of 10,000 atoms
Author(s): I. Kruse; K. Lange; J. Peise; B. Lücke; L. Pezzè; J. Arlt; W. Ertmer; C. Lisdat; L. Santos; A. Smerzi; C. Klempt
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Paper Abstract

Since the pioneering work of Ramsey, atom interferometers are employed for precision metrology, in particular to measure time and to realize the second. In a classical interferometer, an ensemble of atoms is prepared in one of the two input states, whereas the second one is left empty. In this case, the vacuum noise restricts the precision of the interferometer to the standard quantum limit (SQL). Here, we propose and experimentally demonstrate a novel clock configuration that surpasses the SQL by squeezing the vacuum in the empty input state. We create a squeezed vacuum state containing an average of 0.75 atoms to improve the clock sensitivity of 10,000 atoms by 2.05 dB. The SQL poses a significant limitation for today's microwave fountain clocks, which serve as the main time reference. We evaluate the major technical limitations and challenges for devising a next generation of fountain clocks based on atomic squeezed vacuum.

Paper Details

Date Published: 20 February 2017
PDF: 10 pages
Proc. SPIE 10119, Slow Light, Fast Light, and Opto-Atomic Precision Metrology X, 101190D (20 February 2017); doi: 10.1117/12.2250786
Show Author Affiliations
I. Kruse, Leibniz Univ. Hannover (Germany)
K. Lange, Leibniz Univ. Hannover (Germany)
J. Peise, Leibniz Univ. Hannover (Germany)
B. Lücke, Leibniz Univ. Hannover (Germany)
L. Pezzè, QSTAR, INO-CNR (Italy)
Lab. Europeo di Spettroscopie Non-Lineari (Italy)
J. Arlt, Aarhus Univ. (Denmark)
W. Ertmer, Leibniz Univ. Hannover (Germany)
C. Lisdat, Physikalisch-Technische Bundesanstalt (Germany)
L. Santos, Leibniz Univ. Hannover (Germany)
A. Smerzi, QSTAR, INO-CNR (Italy)
Lab. Europeo di Spettroscopie Non-Lineari (Italy)
C. Klempt, Leibniz Univ. Hannover (Germany)


Published in SPIE Proceedings Vol. 10119:
Slow Light, Fast Light, and Opto-Atomic Precision Metrology X
Selim M. Shahriar; Jacob Scheuer, Editor(s)

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