Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · 2610.19751

Quantum-enhanced Search for Galactic Dark Photons Using Cat-State Cavities

Aoying Wang·Yanjie Zeng·Yanyan Cai·Jing Shu·Bin Xu·Yuan Xu·Pan Zheng
View original source ↗Read source document ↗Export metadata ↓

Abstract

We present a quantum-enhanced search for the Galactic dark-photon background (GDPB), a relativistic and anisotropic vector field that can be produced by dark-matter decay or annihilation in the Milky Way halo. We reinterpret an existing quantum-enhanced dark-photon dataset obtained with a superconducting circuit QED platform originally developed for wave-like dark-photon dark-matter searches, consisting of a high-$Q$ niobium cavity in the $\mathrm{TM}_{010}$ mode dispersively coupled to a transmon qubit. By preparing four-component cat states and performing repeated quantum non-demolition parity measurements, analyzed with a hidden Markov model, we extract photon-transition probabilities for multiple cat amplitudes and integration times. The coupling to the GDPB is governed by a polarization- and angle-dependent cavity overlap function, which predicts a distinctive diurnal modulation of the excitation rate for both longitudinal and transverse polarizations. From the absence of such modulation, we set 90\% confidence-level bounds on the kinetic-mixing parameter $ε$ for two benchmark production mechanisms (parametric and cascade decay) over the relativistic mass range $m_X \ll ω_c$.

Explore related subjects

hep-phhep-exquant-ph

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Aoying Wang, Yanjie Zeng, Yanyan Cai, Jing Shu, Bin Xu, Yuan Xu, Pan Zheng. 2026-10-14. Quantum-enhanced Search for Galactic Dark Photons Using Cat-State Cavities. https://arxiv.org/abs/2610.19751

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Search for charged long-lived particles at the Future Circular Collider (FCC-ee)

Long-lived particles (LLPs) have emerged as a compelling signature of physics beyond the standard model, offering unique discovery opportunities at current and future colliders. We present an analysis of charged LLPs leading to signatures with kinked tracks and displaced vertices. Using timing information the search is extended to detector-stable LLPs. We explore the discovery prospects of such particles at the Future Circular Collider~(FCC-ee), a proposed $e^{+}e^{-}$ collider. The clean collision environment of FCC-ee and excellent tracking performance of the IDEA detector enhance the sensitivity to kinked-track signatures, which are considerably more challenging to reconstruct in the high-occupancy environment of hadron colliders. The excellent timing resolution of the timing layer enables us to infer the mass of the detector stable particles. As a benchmark the stau pair production in the gauge mediated supersymmetry breaking (GMSB) within the minimal supersymmetric standard model scenario is considered. In this model the lightest supersymmetric particle is a gravitino and the next-to-lightest supersymmetric particle is the stau, the superpartner of the tau lepton. Discovery sensitivity up to the kinematic limit is obtained for the $ZH$ and $t\bar{t}$ runs of the planned FCC-ee operation. We demonstrate that a potential discovery would allow for a precise $\tildeτ$ mass measurement.

hep-ph↗
arXiv2026

$Z^\prime$ Portal Dark Matter with Observable $ΔN_{\rm eff}$

In the conventional $Z^\prime$ portal dark matter scenario, the prediction of detectable dark matter $χ$ typically relies on the collider sensitivities of $Z^\prime$ and direct detection, where the Majorana type right-handed neutrinos are usually assumed. However, if the right-handed neutrinos $ν_R$ are Dirac type, they will contribute to the additional effective number of relativistic species $ΔN_{\rm eff}$, which brings different detectable predictions for $Z^\prime$ portal dark matter. In light of the great improvement of $ΔN_{\rm eff}$ for the upcoming experiments, we investigate the $Z^\prime$ portal dark matter with Dirac type $ν_R$. Under the $U(1)_{B-L}$ symmetry, this model includes $ν_R$ with $U(1)_{B-L}$ charge $Q_{ν_R}=-1$ and $χ$ with arbitrary $Q_χ$ beyond the SM. Based on the relation in the production of $χ$ and $ν_R$, both the WIMP and FIMP dark matter through the $Z^\prime$ portal scenario are considered. We perform a comprehensive exploration of the viable parameter space under the constraints from $ΔN_{\rm eff}$ induced by thermal and non-thermal $ν_R$, perturbative limit, dark matter direct and indirect detection, and collider searches of $Z^\prime$.

hep-ph↗
arXiv2026

Could $\barΛ_c$ and $Λ_c$ form bound hadronic molecule with explicit $P-wave$ ?

In this article, the explicit $P-wave$ of the $\barΛ_cΛ_c$ dibaryon states with the $J^{PC}=0^{-\pm}$ and $1^{-\pm}$ are studied via twelve interpolated currents. Results show that the positive and negative charge conjugations for the studied states do not have too much difference, the contribution of the gluon from covariant derivative of the current with $P-wave$ could be neglected. The numerical results of the masses of the $P-wave$ $\barΛ_cΛ_c$ are high above the threshold of the two $\barΛ_c$ and $Λ_c$ baryon constituents, $\barΛ_c$ and $Λ_c$ are unlikely to form the bound molecules with explicit $P-wave$ . Pole residues of the related states are also calculated.

hep-ph↗