  We investigate effects of the particle-hole asymmetry on the properties of
Majorana qubtis. Particle-hole asymmetric pertrubation shifts Majorana zero
mode from zero-energy. This type of asymmetry can act as a source of
decoherence in Majorana qubits. We find that particle-hole asymmetric
pertrubation causes phase-shifts and bit-flips decoherence processes in
Majorana qubits. However, these sources of decoherence are negligible in
uniform system with spatially separated Majorana zero modes.
