Towards the Heisenberg limit in microwave photon detection by a qubit array
Patrick Navez, Alexander G. Balanov, Sergey E. Savel'ev, Alexandre M. Zagoskin · Physical review. B./Physical review. B · 2021
Using an analytically solvable model, we show that a qubit array-based detector allows one to achieve the fundamental Heisenberg limit in detecting single photons. In the case of superconducting qubits, this opens other opportunities for quantum sensing and communications in the important microwave range.