2 papers
astro-ph.CO2026
BICEP/Keck XXI: Constraints on Early-Universe Parity Violation from Multipole-Dependent Birefringence
Keck Collaboration, P. A. R. Ade, Zeeshan Ahmed +94
We present the first constraints on multipole-dependent cosmic birefringence using CMB polarization data from the BK18 dataset, which combines observations from BICEP2, Keck Array,…
quant-ph2025
Quantum metrology of low frequency electromagnetic modes with frequency upconverters
Stephen E. Kuenstner, Elizabeth C. van Assendelft, Saptarshi Chaudhuri +11
We present the RF Quantum Upconverter (RQU) and describe its application to quantum metrology of electromagnetic modes between dc and the Very High Frequency band (VHF) (…