Realization of a Fast Triple-Magic All-Optical Qutrit in ^{88}Sr.

Area of Science:

• Atomic Physics
• Quantum Information Science
• Optical Atomic Clocks

Background:

• Optical atomic clocks rely on specific atomic states for high precision.
• Magic trapping conditions are crucial for decoupling atomic and motional states.

Purpose of the Study:

• To demonstrate simultaneous magic trapping for two clock transitions in strontium-88 (Sr-88).
• To operate an all-optical qutrit using ground and metastable states under triple-magic conditions.
• To investigate coherence times and high-fidelity manipulation in this system.

Main Methods:

• Experimental identification and demonstration of triple-magic trapping conditions in Sr-88 at a specific magic angle.
• Operation of a three-level quantum system (qutrit) involving the 1S0, 3P0, and 3P2 states.
• Utilizing two- and three-photon couplings for fast optical control and manipulation within an atom array.

Main Results:

• Achieved simultaneous magic trapping for two clock transitions in Sr-88, establishing triple-magic conditions.
• Demonstrated high-fidelity manipulation between all qutrit states.
• Measured atom-atom coherence times up to 715(30) ms between metastable states at the magic angle.

Conclusions:

• The developed triple-magic trapping technique enables precise quantum control in Sr-88.
• This work paves the way for qutrit-based quantum metrology and enhanced coherence in optical clocks.
• Opens new avenues for high-fidelity manipulation of the Sr-88 fine-structure qubit.