期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.100501
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资金
- LabEx ENS-ICFP [ANR-10-LABX-0010/ANR-10-IDEX-0001-02 PSL*]
- Institut Universitaire de France
- European Union
Superresolution techniques based on intensity measurements after a spatial mode decomposition can overcome the precision of diffraction-limited direct imaging. However, realistic measurement devices always introduce finite crosstalk in any such mode decomposition. Here, we show that any nonzero crosstalk leads to a breakdown of superresolution when the number N of detected photons is large. Combining statistical and analytical tools, we obtain the scaling of the precision limits for weak, generic crosstalk from a device-independent model as a function of the crosstalk probability and N. The scaling of the smallest distance that can be distinguished from noise changes from N-1/2 for an ideal measurement to N-1/4 in the presence of crosstalk.
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