{
  "abstract": "Phase-sensitive parametric devices enable quadrature-selective amplification with the potential for sub-quantum-limited noise performance. In this work, we investigate the operation of a SQUID-based Josephson Parametric Amplifier (JPA), comparing its performance in the phase-preserving and phase-sensitive regimes. The device, fabricated using VTT SWAPS technology, is driven in a three-wave mixing configuration and characterized in a reflection-based measurement setup at millikelvin temperatures. To directly probe the noise performance at low JPA gains, we employ a cascaded amplification scheme in which a Traveling-Wave Parametric Amplifier (TWPA) provides low-noise pre-amplification of the JPA output. In a phase-preserving operation, the JPA exhibits near-quantum-limited performance with a system noise temperature of $351\\pm53$ mK at 6 GHz. In contrast, phase-sensitive operation yields a minimum system noise temperature of $94\\pm12$ mK, well below the standard quantum limit of 288 mK. Our results demonstrate that a JPA-TWPA amplifier cascade opens the door to direct, high-fidelity probing of quantum devices without the need for background noise subtraction.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.25645",
  "author_total": 8,
  "authors": [
    {
      "name": "Ilari Lilja"
    },
    {
      "name": "Ekaterina Mukhanova"
    },
    {
      "name": "Michael Perelshtein"
    },
    {
      "name": "Kirill Petrovnin"
    },
    {
      "name": "Stanislav Khaldeev"
    },
    {
      "name": "Visa Vesterinen"
    },
    {
      "name": "Gheorghe Sorin Paraoanu"
    },
    {
      "name": "Pertti Hakonen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/28checx8jfg5b.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.25645",
  "fulltext_url": null,
  "id": "28checx8jfg5b",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.25645",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "arxiv",
      "quant-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.25645",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/28checx8jfg5b.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2608.25645",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.25645"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.supr-con",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Phase-sensitive cascade quantum amplifier with nearly noiseless operation",
  "title_text": "Phase-sensitive cascade quantum amplifier with nearly noiseless operation",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/28checx8jfg5b",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1007/s10909-026-03458-9",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}