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A shuttling-based two-qubit logic gate for linking distant silicon quantum processors.

Akito Noiri1, Kenta Takeda2, Takashi Nakajima2

  • 1RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan. akito.noiri@riken.jp.

Nature Communications
|September 30, 2022
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate a new method for controlling entanglement between distant silicon quantum processors using spin qubits. This technique, coherent spin shuttling, enables a high-fidelity two-qubit gate, paving the way for scalable quantum computation.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing Hardware
  • Solid-State Physics

Background:

  • Scalable quantum computation requires control of entanglement between distant quantum processors.
  • Silicon quantum dots are a promising platform for large-scale quantum computing due to their integration and nanofabrication capabilities.
  • Current two-qubit gates in silicon spin qubits rely on short-range exchange coupling, limiting the distance between interacting qubits.

Purpose of the Study:

  • To demonstrate a two-qubit gate between distant spin qubits in silicon quantum dots.
  • To establish coherent spin shuttling as a viable technology for linking quantum processors.
  • To overcome the limitations of short-range coupling in silicon quantum dot architectures.

Main Methods:

  • Utilizing coherent spin shuttling to enable controlled interactions between non-neighboring spin qubits.
  • Implementing a shuttling-mode exchange control with an on/off ratio exceeding 1000.
  • Preserving spin coherence during shuttling, achieving 99.6% fidelity for single shuttles.

Main Results:

  • Demonstrated a two-qubit controlled-phase gate with a fidelity of 93%, verified by randomized benchmarking.
  • Achieved efficient switching of exchange coupling via coherent spin shuttling.
  • Maintained high spin coherence during the shuttling process.

Conclusions:

  • Coherent spin shuttling is a key technology for linking distant silicon quantum processors.
  • The demonstrated technique provides a feasible path toward creating quantum links for large-scale quantum computation.
  • This advancement is crucial for modular and scalable quantum computing architectures.