Matter-wave interferometers sensitive to the Sagnac effect are generally restrictedto Mach-Zehnder interferometers, [92, 93, 94]. One notable exceptionis the Sagnac interferometer of Arnold et al., [95]. Matter-wave interferometershave an intrinsic sensitivity much greater than optical Sagnac interferometers,due to the smaller velocity and wavelength of the particles compared to light.Matter-wave interferometers lose out to optical interferometers in that their enclosedarea is limited. Where the sensitivity of optical-fibre interferometers isvery easily scalable, for example by increasing the number of fibre loops, thesensitivity of matter-wave interferometers is not.Optical ring laser gyros can achieve sensitivities of 1.4 × 10−11 rad s−1 Hz−1/2,
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