#
# File:   test14.qasm
# Date:   22-Mar-04
# Author: I. Chuang <[email protected]>
#
# Sample qasm input file - three-qubit FT QEC
# circuit with syndrome measurement

       defbox  synd,4,0,'\txt{Process\\Syndrome}'
       defbox  rop,7,4,'{\symcal R}'

       qubit   q0      # code data qubits
       qubit   q1
       qubit   q2
       qubit   s0,0    # syndrome measurement qubits
       qubit   s1,0
       cbit    c0,0    # classical bits to store syndromes
       cbit    c1,0

       h       s0      # create EPR pair for FT meas
       cnot    s0,s1
       cnot    q0,s0   # measure parity of q0,q1
       nop     s1      # prevent cnot's from colliding
       cnot    q1,s1
       cnot    s0,s1   # uncreate EPR
       h       s0
       measure s0      # measure syndrome qubits
       nop     s1
       measure s1
       cnot    s0,c0   # copy to classical bits
       nop     s1
       cnot    s1,c1
       space   s0

       zero    s0
       zero    s1
       h       s0      # create EPR pair for FT meas
       cnot    s0,s1
       cnot    q1,s0   # measure parity of q1,q2
       nop     s1      # prevent cnot's from colliding
       cnot    q2,s1
       cnot    s0,s1   # uncreate EPR
       h       s0
       measure s0      # measure syndrome qubits
       nop     s1
       measure s1

       synd    s0,s1,c0,c1
       rop     s0,s1,c0,c1,q0,q1,q2

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