A Spin-Photon Interface Using Charge-Tunable Quantum Dots Strongly Coupled to a Cavity
Autor: | Daniel Gammon, Samuel G. Carter, Aziz Karasahin, Michael K. Yakes, Zhouchen Luo, Shuo Sun, Edo Waks, Allan S. Bracker |
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Rok vydání: | 2019 |
Předmět: |
Photon
FOS: Physical sciences Physics::Optics Bioengineering 02 engineering and technology Quantum entanglement Molecular physics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science Quantum computer Spin-½ Physics Quantum network Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics Mechanical Engineering Cavity quantum electrodynamics General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 3. Good health Quantum dot Qubit Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Quantum Physics (quant-ph) |
Zdroj: | Nano letters. 19(10) |
ISSN: | 1530-6992 |
Popis: | Charged quantum dots containing an electron or hole spin are bright solid-state qubits suitable for quantum networks and distributed quantum computing. Incorporating such quantum dot spin into a photonic crystal cavity creates a strong spin-photon interface, in which the spin can control a photon by modulating the cavity reflection coefficient. However, previous demonstrations of such spin-photon interfaces have relied on quantum dots that are charged randomly by nearby impurities, leading to instability in the charge state, which causes poor contrast in the cavity reflectivity. Here we demonstrate a strong spin-photon interface using a quantum dot that is charged deterministically with a diode structure. By incorporating this actively charged quantum dot in a photonic crystal cavity, we achieve strong coupling between the cavity mode and the negatively charged state of the dot. Furthermore, by initializing the spin through optical pumping, we show strong spin-dependent modulation of the cavity reflectivity, corresponding to a cooperativity of 12. This spin-dependent reflectivity is important for mediating entanglement between spins using photons, as well as generating strong photon-photon interactions for applications in quantum networking and distributed quantum computing. |
Databáze: | OpenAIRE |
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