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In analyses of target detection with Gaussian state transmitters in a thermalbackground, the thermal occupation is taken to depend on the targetreflectivity in a way which simplifies the analysis of the symmetric quantumhypothesis testing problem. However, this assumption precludes comparison oftarget detection performance between an arbitrary transmitter and a vacuumstate transmitter, i.e., ``detection without illumination'', which is relevantin a bright thermal background because a target can be detected by its opticalshadow or some other perturbation of the background. Using a target-agnosticthermal environment leads to the result that the oft-claimed 6 dB possiblereduction in the quantum Chernoff exponent for a two-mode squeezed vacuumtransmitter over a coherent state transmitter in high-occupation thermalbackground is an unachievable limiting value, only occurring in a limit inwhich the target detection problem is ill-posed. Further analyzing quantumillumination in a target-agnostic thermal environment shows that a weaksingle-mode squeezed transmitter performs worse than ``no illumination'', whichis explained by the noise-increasing property of reflected low-intensitysqueezed light.

Not even 6 dB: Gaussian quantum illumination in thermal background