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Long-Lived Coherence on a μHz Scale Optical Magnetic Quadrupole Transition.

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Researchers achieved coherent excitation of a narrow atomic transition in strontium atoms. This opens new possibilities for precise atomic clocks, quantum computing, and quantum simulations using the metastable ^{3}P_{2} state.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Spectroscopy

Background:

  • The ^{1}S_{0}-^{3}P_{2} transition in ^{88}Sr is a magnetic quadrupole transition with potential for high-precision measurements.
  • Metastable states like ^{3}P_{2} are crucial for developing advanced quantum technologies.

Purpose of the Study:

  • To coherently excite the ultranarrow ^{1}S_{0}-^{3}P_{2} magnetic quadrupole transition in ^{88}Sr.
  • To characterize the coherence properties and lifetime of the ^{3}P_{2} state.
  • To explore potential applications in quantum computing and simulations.

Main Methods:

  • Confining ^{88}Sr atoms in a state-insensitive optical lattice.
  • Utilizing Ramsey spectroscopy and spin-echo sequences for coherence time measurements.
  • Measuring the excitation fraction and linewidth of the transition.

Main Results:

  • Achieved high excitation fractions (97(1)%) and narrow linewidths (58(1) Hz).
  • Observed coherence times of 14(1) ms, extendable to 266(36) ms with spin-echo.
  • Determined the ^{3}P_{2} level lifetime to be 110(31) min, matching theoretical predictions.

Conclusions:

  • The study successfully demonstrates coherent excitation of a novel strontium clock transition.
  • The long lifetime and coherence of the ^{3}P_{2} state are confirmed, validating theoretical models.
  • These findings establish a new strontium atomic clock transition and enable applications in quantum technologies.