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input_format.md

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Input circuit file format

WARNING: This format only supports the gates_qsim gate set, and is no longer actively maintained. For other gates, circuits must be defined in code or through the qsimcirq interface using Cirq.

The first line contains the number of qubits. The rest of the lines specify gates with one gate per line. The format for a gate is

time gate_name qubits parameters

Here time refers to when the gate is applied in the circuit. Gates with the same time can be applied independently and they may be reordered for performance. Trailing spaces or characters are not allowed. A number of sample circuits are provided in circuits.

Supported gates

Gate Format Example usage
Hadamard time h qubit 0 h 0
T time t qubit 1 t 1
X time x qubit 2 x 2
Y time y qubit 3 y 3
Z time z qubit 4 z 4
√X time x_1_2 qubit 5 x_1_2 5
√Y time y_1_2 qubit 6 y_1_2 6
Rx(φ) = e-iφX/2 time rx qubit phi 7 rx 7 0.79
Ry(φ) = e-iφY/2 time ry qubit phi 8 ry 8 1.05
Rz(φ) = e-iφZ/2 time rz qubit phi 9 rz 9 0.79
Rx,y(θ, φ) = e-iφ(cos(θ)X/2+sin(θ)Y/2) time rxy qubit theta phi 0 rxy 0 1.05 0.79
√W = (√i)Rx,y(π/4, π/2)) time hz_1_2 qubit 1 hz_1_2 1
S time s qubit 2 s 1
CZ time cz qubit1 qubit2 2 cz 2 3
CNOT time cnot qubit1 qubit2 3 cnot 4 5
iSwap time is qubit1 qubit2 4 is 6 7
fSim(θ, φ) time fs qubit1 qubit2 theta phi 5 fs 6 7 3.14 1.57
CPhase(φ) time cp qubit1 qubit2 phi 6 cp 0 1 0.78
Identity (1-qubit) time id1 qubit 7 id1 0
Identity (2-qubit) time id2 qubit 8 id2 0 1
Measurement (n-qubit) time m qubit1 qubit2 ... 9 m 0 1 2 3
Controlled Gate time c control_qubit1 control_qubit2 ... gate 10 c 0 1 rx 4 0.5

Gate times of the gates that act on the same qubits should be ordered. Gates that are out of time order should not cross the time boundaries set by measurement gates. Measurement gates with equal times get fused together.