汉伯里 布朗及特维斯效应（英语：Hanbury Brown and Twiss effect）；由于量子力学的相干性，将一束不相干的光分成二束，它们的强度也能发生干涉，这种现象称为「汉伯里 布朗及特维斯效应」。它是由罗伯特·汉伯利·布朗和理查特·Q·特维斯这两人于1956年发现的。此后，相干和不相干的一束光为二个探测器接受强度相干的现象，统称为「汉伯里 布朗及特维斯效应」。

经典的干涉仪是以观察二束相位相干的光的干涉而工作的。自发现「汉伯里 布朗及特维斯效应」后，也可利用此效应制成光强度相干的干涉仪。测量有距离的星角大小。现在，物理学家依赖这个效应去试验复杂光源的量子性质。

In physics, the Hanbury Brown and Twiss (HBT) effect is any of a variety of correlation and anti-correlation effects in the intensities received by two detectors from a beam of particles. HBT effects can generally be attributed to the dual wave-particle nature of the beam, and the results of a given experiment depend on whether the beam is composed of fermions or bosons. Devices which use the effect are commonly called intensity interferometers and were originally used in astronomy, although they are also heavily used in the field of quantum optics.