  We show the utility of photon added-then-subtracted (PAS) state and two
photon replaced (2PR) state when used in continuous variables measurement
device independent quantum key distribution (CV-MDI-QKD) protocol. We report
that single and two mode PAS state as well as two mode PR state outperform pure
state protocol in the low squeezing and high noise regime. Single mode PAS
state and two mode PAS state showed significant resilience to excess noise and
offered a longer transmission distance when compared to pure and PR state
CV-MDI protocol. Additionally we show that states with higher logarithmic
negativity are not necessarily the best choice when used in CV-MDI-QKD.
