We provide upper and lower bounds on the escape rate of the Bhattacharyya process corresponding to polar codes and transmission over the the binary erasure channel. More precisely, we bound the exponent of the number of subchannels whose Bhattacharyya constant falls in a fixed interval [a, b]. Mathematically this can be stated as bounding the limit limn→∞ 1 n ln P (Zn ∈ [a, b]), where Zn is the Bhattacharyya process. The quantity P(Zn ∈ [a, b]) represents the fraction of sub-channels that are still un-polarized at time n.
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