BV qn -> (qn+1) qubits

mem = 16 * 2**(qn+1) bytes

>>> qn=28
>>> 16 * 2**(qn+1)
8589934592

>>> qn=32
>>> 16 * 2**(qn+1)
137438953472
 

BV 32 slowdown due to swapping on 128 GB system, physical mem exceeded:

  BV 31 ->  1335.74 secs
  BV 32 -> 45955.53 secs


BV 33 -> malloc() fails