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Entanglement between a single quantum spin and a photon through ultrafast frequency downconversion to telecom wavelengths

Kristiaan De Greve, Leo Yu, Peter L. McMahon +12 more

Bulletin of the American Physical SocietyMar 18, 20130 citations

Transfer and retrieval of telecom-wavelength picoseconds single-photon qubits to quantum dots

Kazumasa Suzuki, Koichiro Konishi, Kouichi Akahane +1 more

電子情報通信学会技術研究報告. LQE, レーザ・量子エレクトロニクスMay 10, 20130 citations

Two-photon interference at telecom wavelengths for time-bin-encoded single photons from quantum-dot spin qubits

Leo Yu, Chandra M. Natarajan, Tomoyuki Horikiri +11 more

Practical quantum communication between remote quantum memories rely on single photons at telecom wavelengths. Although spin-photon entanglement has been demonstrated in atomic and solid-state qubit systems, the produced single photons at short wavelengths and with polarization encoding are not suitable for long-distance communication, because they suffer from high propagation loss and depolarization in optical fibres. Establishing entanglement between remote quantum nodes would further require the photons generated from separate nodes to be indistinguishable. Here, we report the observation of correlations between a quantum-dot spin and a telecom single photon across a 2-km fibre channel based on time-bin encoding and background-free frequency downconversion. The downconverted photon at telecom wavelengths exhibits two-photon interference with another photon from an independent source, achieving a mean wavepacket overlap of greater than 0.89 despite their original wavelength mismatch (900 and 911 nm). The quantum-networking operations that we demonstrate will enable practical communication between solid-state spin qubits across long distances.Practical quantum communication between remote quantum memories rely on single photons at telecom wavelengths. Although spin-photon entanglement has been demonstrated in atomic and solid-state qubit systems, the produced single photons at short wavelengths and with polarization encoding are not suitable for long-distance communication, because they suffer from high propagation loss and depolarization in optical fibres. Establishing entanglement between remote quantum nodes would further require the photons generated from separate nodes to be indistinguishable. Here, we report the observation of correlations between a quantum-dot spin and a telecom single photon across a 2-km fibre channel based on time-bin encoding and background-free frequency downconversion. The downconverted photon at telecom wavelengths exhibits two-photon interference with another photon from an independent source, achieving a mean wavepacket overlap of greater than 0.89 despite their original wavelength mismatch (900 and 911 nm). The quantum-networking operations that we demonstrate will enable practical communication between solid-state spin qubits across long distances.

Nature CommunicationsNov 24, 201550 citations

Quantum frequency down-conversion of single photons from a quantum dot to the telecom band

Lenhard, Zaske, Kesler +8 more

Conference on Lasers and Electro-OpticsJan 1, 20120 citations

Ultrafast downconversion quantum interface for a single quantum dot spin and 1550-nm single-photon channel

Leo Yu, Jason S. Pelc, Kristiaan De Greve +13 more

We report an ultrafast downconversion quantum interface, where 910-nm single photons from a quantum dot are downconverted to the 1.5-µm telecom band with sub-10 picosecond pulses at 2.2-µm, enabling the demonstration of quantum-dot spin-photon entanglement.

Jan 1, 20131 citation

Observation of quantum dot spin-photon entanglement

Ataç İmamoğlu

Bulletin of the American Physical SocietyMar 18, 20130 citations

Quantum-dot spin–photon entanglement via frequency downconversion to telecom wavelength

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Quantum-dot spin–photon entanglement via frequency downconversion to telecom wavelength

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