  We study the quantum-vacuum geometric phases resulting from the vacuum
fluctuation of photon fields in Tomita-Chiao-Wu noncoplanar curved fibre
system, and suggest a scheme to test the potential existence of such vacuum
effect. Since the signs of the quantum-vacuum geometric phases of left- and
right- handed (LRH) circularly polarized light are just opposite, the total
geometric phases at vacuum level is inescapably absent in the fibre experiments
performed previously by other authors. By using the present approach where the
fibre made of gyroelectric media is employed, the quantum-vacuum geometric
phases of LRH light cannot be exactly cancelled, and may therefore be achieved
test experimentally.
