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Deterministic and reconfigurable graph state generation with a single solid-state quantum emitter.

H Huet1, P R Ramesh2,3, S C Wein4

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This summary is machine-generated.

Researchers demonstrate a new method for creating complex entangled states using a single quantum dot. This breakthrough advances scalable photonic quantum computing by enabling reconfigurable graph state generation with high fidelity.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Photonics

Background:

  • Measurement-based quantum computing (MBQC) requires efficient generation of entangled photonic graph states.
  • Deterministic sources are crucial for scalable photonic quantum computation.
  • Previous work utilized optical and microwave quantum emitters.

Purpose of the Study:

  • To demonstrate deterministic and reconfigurable graph state generation using integrated optical solid-state quantum emitters.
  • To explore the potential of a single semiconductor quantum dot in a cavity for generating complex graph states.

Main Methods:

  • Utilized a single semiconductor quantum dot in a cavity.
  • Employed fast detuned optical pulses for spin state control.
  • Generated caterpillar graph states, a versatile type of graph state.
  • Performed quantum state tomography on successive photons.

Main Results:

  • Achieved deterministic and reconfigurable generation of caterpillar graph states.
  • Measured high Bell state fidelities (up to 0.80 ± 0.04) and concurrences (up to 0.69 ± 0.09).
  • Maintained high photon indistinguishability.

Conclusions:

  • The demonstrated optical scheme is compatible with existing quantum dot technology.
  • This method offers a scalable pathway towards fault-tolerant quantum computing using spins and photons.
  • Enables on-demand control over entanglement topology for quantum information processing.