Time crystals scale quantum precision with system size—up to N cubed

Researchers from the University of Milan in Italy, Khalifa University of Science and Technology in the United Arab Emirates, and the University of Electronic Science and Technology of China report that the precision of certain quantum sensors improves dramatically, scaling with the cube of the system size. The study demonstrates a cubic scaling, represented as f_(global)~ N^3, in quantum precision for boundary time crystals, suggesting a path toward building larger, more sensitive devices. This work investigates quantum-enhanced parameter estimation through continuous monitoring of dissipative time crystals, revealing that the transverse collective dephasing model offers a particularly robust platform for quantum metrology. Eoin O’Connor, Victor Montenegro, Francesco Albarelli, Matteo G. A. Paris, Abolfazl Bayat, and Marco G. Genoni detailed a cubic scaling in the quantum Fisher information, a key metric for precision, demonstrating a potential pathway to building significantly more sensitive quantum sensors. The…