Optical Detection and Storage of Entanglement in Plasmonically Coupled Quantum Dot Qubits
| Autor: | Matthew Otten, German V. Kolmakov, Stephen K. Gray |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Quantum Physics Photon Strongly Correlated Electrons (cond-mat.str-el) Cavity quantum electrodynamics Physics::Optics FOS: Physical sciences Quantum entanglement Quantum channel Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences 010305 fluids & plasmas Condensed Matter - Strongly Correlated Electrons Quantum cryptography Quantum dot Qubit Quantum mechanics 0103 physical sciences 010306 general physics Quantum Physics (quant-ph) Quantum Physics - Optics Optics (physics.optics) |
| DOI: | 10.48550/arxiv.1811.12232 |
| Popis: | Recent proposals and advances in quantum simulations, quantum cryptography and quantum communications substantially rely on quantum entanglement formation. Contrary to the conventional wisdom that dissipation destroys quantum coherence, coupling with a dissipative environment can also generate entanglement. We consider a system composed of two quantum dot qubits coupled with a common, damped surface plasmon mode; each quantum dot is also coupled to a separate photonic cavity mode. Cavity quantum electrodynamics calculations show that upon optical excitation by a femtosecond laser pulse, entanglement of the quantum dot excitons occurs, and the time evolution of the $g^{(2)}$ pair correlation function of the cavity photons is an indicator of the entanglement. We also show that the degree of entanglement is conserved during the time evolution of the system. Furthermore, if coupling of the photonic cavity and quantum dot modes is large enough, the quantum dot entanglement can be transferred to the cavity modes to increase the overall entanglement lifetime. This latter phenomenon can be viewed as a signature of entangled, long-lived quantum dot exciton-polariton formation. The preservation of total entanglement in the strong coupling limit of the cavity/quantum dot interactions suggests a novel means of entanglement storage and manipulation in high-quality optical cavities. Comment: 26 pages, 7 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|