Dispersive qubit readout with squeezed light gives exponential temperature-precision improvement only in zero-temperature, zero-time, or zero-photon limits; a claimed Heisenberg 1/N scaling for N bath-coupled qubits rests on a questionable noise approximation.
Krinner et al., Realizing repeated quantum error cor- rection in a distance-three surface code, Nature (London) 605, 669C674 (2022)
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Dispersive Qubit Readout of Temperature
Dispersive qubit readout with squeezed light gives exponential temperature-precision improvement only in zero-temperature, zero-time, or zero-photon limits; a claimed Heisenberg 1/N scaling for N bath-coupled qubits rests on a questionable noise approximation.