Generating and verifying entangled itinerant microwave fields with efficient and independent measurements
| Autor: | Scott Glancy, William Kindel, Konrad Lehnert, François Mallet, Kent D. Irwin, Hsiang-Sheng Ku, Gene C. Hilton, Leila R. Vale |
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| Rok vydání: | 2015 |
| Předmět: |
Superconductivity
Physics Quantum network Quantum Physics Field (physics) FOS: Physical sciences Quantum entanglement State (functional analysis) 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas Quantum mechanics 0103 physical sciences 010306 general physics Quantum Physics (quant-ph) Entanglement witness Microwave Quantum computer |
| Zdroj: | ResearcherID |
| DOI: | 10.48550/arxiv.1502.03884 |
| Popis: | By combining a squeezed propagating microwave field and an unsqueezed vacuum field on a hybrid (microwave beam splitter), we generate entanglement between the two output modes. We verify that we have generated entangled states by making independent and efficient single-quadrature measurements of the two output modes. We observe the entanglement witness ${E}_{\mathrm{W}}=\ensuremath{-}0.{263}_{\ensuremath{-}0.036}^{+0.001}$ and the negativity $N=0.{0824}_{\ensuremath{-}0.0004}^{+0.01}$ with measurement efficiencies at least $26\ifmmode\pm\else\textpm\fi{}0.1%$ and $41\ifmmode\pm\else\textpm\fi{}0.2%$ for channels 1 and 2, respectively. These measurements show that the output two-mode state violates the separability criterion and therefore demonstrates entanglement. This shared entanglement between propagating microwaves provides an important resource for building quantum networks with superconducting microwave systems. |
| Databáze: | OpenAIRE |
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