Hyperfine Spectroscopy and Fast, All-Optical Arbitrary State Initialization and Readout of a Single, Ten-Level...

Area of Science:

• Quantum Information Science
• Condensed Matter Physics
• Atomic, Molecular, and Optical Physics

Background:

• High-spin nuclei coupled to color centers offer potential for quantum memory applications.
• The germanium vacancy (GeV) in diamond possesses favorable spectral properties for quantum applications.
• The ^{73}Ge nucleus within the GeV offers a ten-dimensional Hilbert space (I=9/2).

Purpose of the Study:

• To investigate the hyperfine structure of the ^{73}Ge nucleus in the GeV.
• To demonstrate nuclear spin readout and optical initialization capabilities for the ^{73}Ge spin.
• To establish the ^{73}GeV as a viable platform for quantum information processing and metrology.

Main Methods:

• Observation of the hyperfine structure of the ^{73}GeV.
• Development of nuclear spin readout protocols.
• Optical initialization of the ^{73}Ge nuclear spin into arbitrary eigenstates.

Main Results:

• Successful observation of the ^{73}GeV hyperfine structure.
• Demonstration of nuclear spin readout with high fidelity.
• Optical initialization of the ^{73}Ge spin achieved on a microsecond timescale with up to ~84% fidelity.
• Access to the ten-dimensional Hilbert space of the I=9/2 ^{73}Ge nucleus.

Conclusions:

• The ^{73}GeV serves as an optically addressable high-spin quantum platform.
• This platform enables high-efficiency spin-photon interfaces.
• The ^{73}GeV is suitable for foundational quantum physics research and metrology applications.