We report about a significant advancement in the search speed of axion dark matter with cavity-based haloscopes. Our approach combines a 3D cavity with a transmon-based single microwave photon counter (SMPD) devised to detect itinerant photons, a circuit-QED architecture compatible with the strong magnetic fields required for axion-to-photon conversion.
In the SMPD, an incoming photon is...
We propose and experimentally demonstrate a novel method for cavity frequency tuning in cavity haloscope experiments by coupling with a superconducting qubit. Compared to the existing tuning-rod approach, this alternative method addresses a few advantages: (a) easy implementation, (b) reduction of electromagnetic wave leakage, and (c) fast scanning because there is no thermal noise derived...
Supernova (SN) explosions could emit vast amounts of axions, and axionlike particles, in a short time. In this talk, we will show how the spectrum of these axions is calculated to unprecedented precision in recent years. In particular, in the SN plasma quantum-loop effects can dominate axion production or absorption processes, and can also play a vital role in their conversion to visible...
Axion quark nuggets are hypothetical particles composed of (anti-)quarks in a unique phase called the color superconducting state, surrounded by an axion domain wall. This model proposes an alternative candidate for cold dark matter compared to conventional halo-axions. Under the hypothesis that anti-matter axion quark nuggets could annihilate with Earth matter, releasing relativistic axions,...
The axion is a well-motivated dark matter candidate with an extensive range of mass unexplored experimentally. New string production models for the post-inflation QCD axion predict higher axion masses than we have explored with modern haloscopes. While traditional tunable cavity-based haloscopes have proven exquisitely sensitive at lower frequencies, their sensitivity drops off at higher...
The Haloscope At Yale Sensitive To Axion CDM (HAYSTAC) Experiment is actively searching for QCD axions using a resonant microwave cavity enhanced by a quantum squeezed state receiver (SSR). Because the axion’s mass and coupling strength are unknown, a crucial metric is the scanning rate across the parameter space. Integration of the SSR into the HAYSTAC experiment has allowed for a scan rate...
The nature of dark matter in the Universe is still an open question in
astrophysics and cosmology. Axions and axion-like particles (ALPs) offer a
compelling solution, and traditionally ground-based experiments have eagerly,
but to date unsuccessfully, searched for these hypothetical low-mass particles
that are expected to be produced in large quantities in the strong
electromagnetic...
