Scalable Quantum Logic Spectroscopy.

Area of Science:

• Quantum information science
• Atomic physics
• Spectroscopy

Background:

• Quantum logic spectroscopy (QLS) enables precision measurements of inaccessible atomic and molecular ions.
• Applications include atomic clocks and fundamental physics tests.
• Scaling QLS to larger ion numbers is a significant challenge.

Purpose of the Study:

• To develop a new technique for scaling quantum logic spectroscopy (QLS).
• To address the limitations of current QLS methods for larger ion numbers.
• To improve the stability and precision of atomic clocks and fundamental physics tests.

Main Methods:

• Development of a novel Schrödinger cat interferometer technique.
• Demonstration using combinations of ^{25}Mg^{+} logic ions and ^{27}Al^{+} spectroscopy ions.
• Investigation of detection efficiency with varying numbers of ^{25}Mg^{+} ions.

Main Results:

• Successful demonstration of the Schrödinger cat interferometer for QLS.
• Observed increased detection efficiency with a larger number of ^{25}Mg^{+} ions.
• Potential for improved stability in high-accuracy optical clocks using multiple ^{27}Al^{+} ions.

Conclusions:

• The new Schrödinger cat interferometer technique effectively scales quantum logic spectroscopy (QLS).
• This method enhances detection efficiency and offers a pathway to Heisenberg-limited QLS.
• The technique promises significant advancements for atomic clocks and fundamental physics research.