Photon-mediated interactions between quantum emitters in a diamond nanocavity.

Area of Science:

• Quantum Optics
• Solid-State Quantum Information
• Nanophotonics

Background:

• Photon-mediated interactions are fundamental for quantum networks and scalable quantum information processing.
• Silicon-vacancy (SiV) color centers in diamond are promising solid-state qubits.
• Coupling quantum emitters to optical cavities enhances light-matter interactions.

Purpose of the Study:

• To demonstrate and control photon-mediated interactions between pairs of SiV color centers.
• To leverage these interactions for scalable quantum information processing and quantum networks.
• To explore the use of spin degrees of freedom for controlling optical interactions.

Main Methods:

• Coupling pairs of SiV color centers to a shared diamond nanophotonic cavity.
• Tuning the optical transitions of the SiV centers into resonance with the cavity mode.
• Utilizing the electronic spin of the SiV centers to control the mediated interactions.

Main Results:

• Achieved coherent interaction between two SiV centers mediated by the cavity.
• Observed spectrally resolved superradiant and subradiant states due to resonant coupling.
• Demonstrated control over these interactions using the spin properties of the SiV centers.

Conclusions:

• Controlled photon-mediated interactions between SiV centers are achievable via cavity coupling.
• These interactions are essential for developing cavity-mediated quantum gates between spin qubits.
• The demonstrated control is a key step towards scalable quantum network nodes.