---
res:
  bibo_abstract:
  - "We recently showed that macroscopic nuclear spin ensembles prepared in coherent
    spin states can dramatically enhance the interaction rates of weakly interacting
    cosmic relics, such as dark matter and the cosmic neutrino background, through
    collective quantum effects analogous to Dicke superradiance, where the deexcitation
    and excitation rates scale as the square of the number of spins \U0001D4412. We
    thus coined these processes superradiant interactions. In this paper, we propose
    a protocol to realize this enhancement and boost the discovery potential for such
    relics. We show how concepts from quantum optics can be adapted to nuclear spins
    coupled to superconducting circuits, enabling high-sensitivity systems. The spins
    are first initialized into a coherent spin state via a \U0001D70B/2 Rabi pulse
    from the ground state. When the circuit is sufficiently detuned from resonance,
    the spin-circuit interaction implements a squeezing Hamiltonian. Because squeezing
    must outpace spin relaxation and dephasing, the protocol favors macroscopic ensembles
    and high-quality superconducting circuits. During this squeezing phase, the standard
    quantum variance is reduced by up to 4.8 orders of magnitude, equivalent to 48
    dB of squeezing, for circuits with quality factors \U0001D444∼10^8–10^9. The signal
    imprinted on the spins during the squeezing protocol can be magnified by further
    utilizing the squeezing interactions, easing the requirement for shot-noise-limited
    readout. This protocol has the potential to significantly accelerate axion and
    dark photon dark matter searches and extend the reach of existing axion experiments
    to probe QCD axion-nuclear spin couplings. More broadly, it paves the way for
    detecting coherent inelastic interactions from other cosmic relics, most notably
    the cosmic neutrino background, and establishes nuclear-spin-based systems as
    a class of quantum, ultra-low-threshold detectors.@eng"
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Marios
      foaf_name: Galanis, Marios
      foaf_surname: Galanis
  - foaf_Person:
      foaf_givenName: Onur
      foaf_name: Hosten, Onur
      foaf_surname: Hosten
      foaf_workInfoHomepage: http://www.librecat.org/personId=4C02D85E-F248-11E8-B48F-1D18A9856A87
    orcid: 0000-0002-2031-204X
  - foaf_Person:
      foaf_givenName: Asimina
      foaf_name: Arvanitaki, Asimina
      foaf_surname: Arvanitaki
  - foaf_Person:
      foaf_givenName: Savas
      foaf_name: Dimopoulos, Savas
      foaf_surname: Dimopoulos
  bibo_doi: 10.1103/Z2D9-4GV6
  bibo_issue: '6'
  bibo_volume: 113
  dct_date: 2026^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/2469-9926
  - http://id.crossref.org/issn/2469-9934
  dct_language: eng
  dct_publisher: American Physical Society@
  dct_title: Superradiant interactions for relic detection with entangled nuclear
    spins@
...