Quantum state truncation using an optical parametric amplifier and a beam splitter
| Autor: | Mattos, Eric Perides, 1997, Vidiella Barranco, Antonio, 1963 |
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| Přispěvatelé: | UNIVERSIDADE ESTADUAL DE CAMPINAS |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Repositório Institucional da Unicamp Universidade Estadual de Campinas (UNICAMP) instacron:UNICAMP Repositório da Produção Científica e Intelectual da Unicamp |
| Popis: | Agradecimentos: E.P.M. would like to acknowledge financial suport from CAPES (Coordenadoria de Aperfeiçoamento de Pessoal de Nível Superior), Brazil, Grant No. 88887.514500/2020-00. This work was also supported by CNPq (Conselho Nacional para o Desenvolvimento Científico e Tecnológico, Brazil) via the INCT-IQ (National Institute for Science and Technology of Quantum Information), Grant No. 465469/2014-0 Abstract: We present a scheme of quantum state truncation in the Fock basis (quantum scissors), based on the combined action of a nondegenerate optical parametric amplifier and a beam splitter. Differently from previously proposed linear-optics-based quantum scissors devices, which depend on reliable Fock state sources, our scheme requires only readily available Gaussian states, such as coherent state inputs (vacuum state included). A truncated state is generated after performing photodetections in the global state. We find that, depending on which output ports each of the two photodetectors is positioned, different types of truncated states may be produced: (i) states having a maximum Fock number of N, or (ii) states having a minimum Fock number N. In order to illustrate our method, we discuss an example having as input states a coherent state in the beam splitter and vacuum states in the amplifier, and show that the resulting truncated states display nonclassical properties, such as subPoissonian statistics and squeezing. We quantify the nonclassicality degree of the generated states using the Wigner-Yanase skew information measure. For complementarity, we discuss the efficiency of the protocol, e.g., generation probability as well as the effects of imperfections such as the detector's quantum efficiency and dark counts rate COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ Fechado |
| Databáze: | OpenAIRE |
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