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Two-photon interference at telecom wavelengths for time-bin-encoded single photons from quantum-dot spin qubits
Leo Yu1, Chandra M Natarajan1,2,3, Tomoyuki Horikiri2,4
1E. L. Ginzton Laboratory, Stanford University, 348 Via Pueblo Mall, Stanford, California 94305, USA.
Nature Communications
|November 25, 2015
Summary
Researchers achieved correlations between quantum dots and telecom photons over 2 km, enabling indistinguishable photons for quantum networking. This breakthrough advances practical quantum communication using solid-state spin qubits.
Area of Science:
- Quantum communication
- Quantum networking
- Solid-state quantum systems
Background:
- Practical quantum communication requires single photons at telecom wavelengths for long-distance transmission.
- Existing spin-photon entanglement methods produce short-wavelength photons unsuitable for optical fibers due to high loss and depolarization.
- Indistinguishable photons from separate quantum nodes are crucial for establishing remote entanglement.
Purpose of the Study:
- To demonstrate correlations between a quantum-dot spin and a telecom single photon over a 2-km fiber channel.
- To enable practical quantum communication between remote solid-state spin qubits.
Main Methods:
- Utilized time-bin encoding and background-free frequency downconversion to generate telecom-wavelength photons.
- Demonstrated two-photon interference between the downconverted photon and a photon from an independent source.
Main Results:
- Observed correlations between a quantum-dot spin and a telecom single photon across a 2-km fiber.
- Achieved a mean wavepacket overlap greater than 0.89 for photons from independent sources with original wavelength mismatch (900 and 911 nm).
- Successfully demonstrated quantum networking operations.
Conclusions:
- The developed method enables practical quantum communication between remote quantum memories.
- This work paves the way for long-distance communication using solid-state spin qubits.
- The demonstrated quantum networking operations are vital for future quantum internet infrastructure.
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