Spin-photon entanglement and photonic cluster states generation with a semiconductor quantum dot in a cavity

Coste, Nathan; Fioretto, Dario; Belabas, Nadia; Wein, Stephen C.; Hilaire, Paul; Rafail, Frantzeskakis,; Gundin, Manuel; Goes, Bruno Teixeira; Somaschi, Niccolò; Morassi, Martina; Lemaı̂tre, A.; Sagnes, I.; Harouri, A.; Economou, Sophia E.; Auffèves, Alexia; Krebs, O.; Lanco, L.; Senellart, P.

doi:10.1117/12.2653521

Cited by 1 publication

(2 citation statements)

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“…Magneto-optical quantum dot-based experiments usually rely on large and complex superconducting magnets [7,26], which generate strong magnetic fields but require both a stabilized current source and cryogenic temperatures. However, many experiments need only a "set-and-forget" static magnetic field of around 500 mT, which can be achieved with compact strong permanent magnets cooled down together with the quantum dot device [27][28][29].…”

Section: Permanent Magnet Assemblymentioning

confidence: 99%

“…An efficient, tunable spin-photon interface that allows high fidelity entanglement of spin qubits with flying qubits, photons, lies at the heart of many building blocks of distributed quantum technologies [1], ranging from quantum repeaters [2], photonic gates [3,4], to the generation of photonic cluster states [5][6][7]. Further, to secure connectivity within the quantum network, an ideal spin-photon interface requires near-unity collection efficiency, therefore an atom or semiconductor quantum dot (QD) carrying a single spin as a quantum memory is integrated into photonic structures such as optical microcavities cavities, where recently 57 % in-fiber photon collection efficiency has been achieved [8].…”

Section: Introductionmentioning

confidence: 99%

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Resonant two-laser spin-state spectroscopy of a negatively charged quantum dot-microcavity system with a cold permanent magnet

Steindl¹,

Ent²,

Meer³

et al. 2023

Preprint

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A high-efficiency spin-photon interface is an essential piece of quantum hardware necessary for various quantum technologies. Self-assembled InGaAs quantum dots have excellent optical properties, if embedded into an optical micro-cavity they can show near-deterministic spin-photon entanglement and spin readout, but an external magnetic field is required to address the individual spin states, which usually is done using a superconducting magnet. Here, we show a compact cryogenically compatible SmCo magnet design that delivers 475 mT in-plane Voigt geometry magnetic field at 5 K, which is suitable to lift the energy degeneracy of the electron spin states and trion transitions of a single InGaAs quantum dot. This quantum dot is embedded in a birefringent high-finesse optical micro-cavity which enables efficient collection of single photons emitted by the quantum dot. We demonstrate spin-state manipulation by addressing the trion transitions with a single and two laser fields. The experimental data agrees well to our model which covers single-and two-laser cross-polarized resonance fluorescence, Purcell enhancement in a birefringent cavity, and variation of the laser powers.

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