Atomic Quadrupole Moment Measurement Using Dynamic Decoupling.
We present a method that uses dynamic decoupling of a multilevel quantum probe to distinguish small frequency shifts that depend on m_{j}^{2}, where m_{j}^{2} is the angular momentum of level |j⟩ along the quantization axis, from large noisy shifts that are linear in m_{j}, such as those due to magnetic field noise. Using this method we measured the electric-quadrupole moment of the 4D_{5/2} level in ^{88}Sr^{+} to be 2.973_{-0.033}^{+0.026}ea_{0}^{2}. Our measurement improves the uncertainty of this value by an order of magnitude and thus helps mitigate an important systematic uncertainty in ^{88}Sr^{+} based optical atomic clocks and verifies complicated many-body quantum calculations.
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel.
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Shaniv
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel.
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Akerman
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel.
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Ozeri