Fig. 1 | Nature Communications

Fig. 1

From: Heisenberg-limited single-mode quantum metrology in a superconducting circuit

Fig. 1

Single-mode quantum metrology architectures. a, b Single-atom Ramsey interferometer with a total angular momentum number J. The best precision can be achieved by using the superposition of |J, −J〉 and |J, J〉 with the maximum variance of angular momentum. c, d Single-mode Ramsey interferometer for photons/bosons with an optimal precision achieved by the superposition of Fock states with the maximal variance of photon numbers for a given mean photon number. e, f Schematic illustrations of the single-mode sensing architecture and the experimental circuit quantum electrodynamics system. A single qubit couples to two photonic cavity modes, with the two modes serving as the sensing mode and the ancillary qubit readout mode, respectively. The two boxes represent the microwave cavities, between which the ancillary superconducting qubit on a chip is located in a waveguide trench

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