Quantum teleportation using coherent emission from telecom C-band quantum dots
| Autor: | Jon Heffernan, Joanna Skiba-Szymanska, Matthew Anderson, Tina Müller, Andrew J. Shields, David A. Ritchie, Jan Huwer, Andrey B. Krysa, R. Mark Stevenson |
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| Přispěvatelé: | Anderson, Matthew [0000-0001-8747-1187], Ritchie, David [0000-0002-9844-8350], Apollo - University of Cambridge Repository |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Photon business.industry Physics::Optics Quantum Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Laser Teleportation law.invention Computer Science::Emerging Technologies quant-ph law Quantum dot Qubit Photon polarization Telecommunications business Quantum teleportation Coherence (physics) |
| Zdroj: | Quantum Information and Measurement (QIM) V: Quantum Technologies. |
| DOI: | 10.1364/qim.2019.s2a.4 |
| Popis: | A practical way to link separate nodes in quantum networks is to send photons over the standard telecom fibre network. This requires sub-Poissonian photon sources in the telecom wavelength band around 1550 nm, where the photon coherence time has to be sufficient to enable the many interference-based technologies at the heart of quantum networks. Here, we show that droplet epitaxy InAs/InP quantum dots emitting in the telecom C-band can provide photons with coherence times exceeding 1 ns even under non-resonant excitation, more than a factor two longer than values reported for shorter wavelength quantum dots under similar conditions. We demonstrate that these coherence times enable near-optimal interference with a C-band laser qubit, with visibilities only limited by the quantum dot multiphoton emission. Using entangled photons, we further show teleportation of such qubits in six different bases with average fidelity reaching 88.3$\pm$4%. Beyond direct applications in long-distance quantum communication, the high degree of coherence in these quantum dots is promising for future spin based telecom quantum network applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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