48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
import cupy as cp
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import numpy as np
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from cuquantum import cutensornet as cutn
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from qibotn.circuit_convertor import QiboCircuitToEinsum
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from qibotn.mps_utils import apply_gate, initial
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class QiboCircuitToMPS:
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"""A helper class to convert Qibo circuit to MPS.
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Parameters:
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circ_qibo: The quantum circuit object.
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gate_algo(dict): Dictionary for SVD and QR settings.
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datatype (str): Either single ("complex64") or double (complex128) precision.
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rand_seed(int): Seed for random number generator.
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"""
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def __init__(
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self,
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circ_qibo,
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gate_algo,
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dtype="complex128",
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rand_seed=0,
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):
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np.random.seed(rand_seed)
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cp.random.seed(rand_seed)
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self.num_qubits = circ_qibo.nqubits
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self.handle = cutn.create()
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self.dtype = dtype
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self.mps_tensors = initial(self.num_qubits, dtype=dtype)
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circuitconvertor = QiboCircuitToEinsum(circ_qibo, dtype=dtype)
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for gate, qubits in circuitconvertor.gate_tensors:
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# mapping from qubits to qubit indices
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# apply the gate in-place
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apply_gate(
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self.mps_tensors,
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gate,
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qubits,
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algorithm=gate_algo,
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options={"handle": self.handle},
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)
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def __del__(self):
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cutn.destroy(self.handle)
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