qympy 1.2.0

Symbolic Calculation of Quantum Computation with Sympy

Qympy - Quantum Analytic Computation with Sympy

A sympy based python package for symbolic calculation of $n$-qubit quantum state. See GitHub: https://github.com/r08222011/Qympy

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Installation

Simply run, see Qympy

pip install qympy

Get Started

1. Circuit Initialization Common circuits ansatz can be found in /src/qympy/quantum_circuit. To build a circuit from beginning, use sp_circuit.Circuit. The basic use of Circuit is same as Qiskit. For example:

from qympy.quantum_circuit.sp_circuit import Circuit

qc = Circuit(3)   # initialize a 3-qubit quantum circuit
qc.h(0)           # Hadamard gate on 0th qubit
qc.ry("x", 0)     # y-rotation on 0th qubit with theta = x
qc.rxx("y", 1, 2) # xx-rotation on 1st and 2nd qubits with theta = y
qc.cx(0,1)        # CNOT on 1st and 2nd qubits
qc.cz(1,2)        # CZ on 1st and 2nd qubits

2. Draw the circuit We now have initialized a quantum circuit. To see the circuit we built, we can use Circuit.draw(). This method use qiskit.circuit.QuantumCircuit.draw with draw('mpl') as default. For example:

qc.draw("mpl")

3. Evolve and measure the circuit The last step for getting the analytic expression is to call the method Circuit.evolve_state(). This will calculate the final state with the gates applied. After evolving the quantum state, we can measure the quantum state with X, Y, Z basis with a single certain qubit. For example:

qc.evolve()
print(sp.latex(qc.measure(2, "Z")))
qc.measure(2, "Z")

Note, you can see the prettier expression with jupyter.