Optical single-shot readout of spin qubits in silicon

Area of Science:

• Quantum Computing
• Quantum Information Science
• Materials Science

Background:

• Spin qubits in silicon demonstrate long coherence times and surpass error correction thresholds.
• Interfacing these qubits with larger quantum processors remains a significant challenge.
• Optical interfaces offer advantages for modular quantum computing, reducing heat load and cross-talk.

Purpose of the Study:

• To implement an efficient spin-photon interface for silicon spin qubits.
• To enable optical single-shot readout and remote entanglement of spin qubits.
• To advance modular and scalable quantum computing architectures.

Main Methods:

• Utilized erbium dopants within a nanophotonic resonator to create a spin-photon interface.
• Demonstrated optical single-shot readout of a spin qubit in silicon.
• Leveraged the coherence properties of spin qubits exceeding their Purcell-enhanced optical lifetime.

Main Results:

• Successfully implemented an efficient spin-photon interface based on erbium-doped silicon.
• Achieved optical single-shot readout of a spin qubit with coherence surpassing optical lifetime.
• Showcased the potential for entangling remote spins via photon interference.

Conclusions:

• The demonstrated hardware platform, using erbium-doped silicon, is promising for distributed quantum information processing.
• Spectral multiplexing of multiple qubits per resonator and fiber-compatible photon emission support scalability.
• This approach facilitates the development of integrated, scalable silicon quantum devices for future quantum networks.