The method 13, wherein said Unet sequence of {TAIL ~ operations} comprises a sequence of elementary operations on {HEAD ~ qubits} 
The method 13 , wherein said Unet sequence of { TAIL ~ operations } comprises a sequence of elementary operations on { HEAD ~ qubits }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD