mindquantum.simulator.NoiseBackend

class mindquantum.simulator.NoiseBackend(base_sim: str, n_qubits: int, adder: ChannelAdderBase, seed: int = None, dtype=None)

Noise simulator backend based on channel adder.

Parameters

• base_sim (str) – The simulator that supported by MindQuantum.

• n_qubits (int) – The qubit number of this noise simulator.

• adder (ChannelAdderBase) – A channel adder that can transform a circuit to noise circuit.

• seed (int) – A random seed. Default: None.

• dtype (mindquantum.dtype) – The data type of simulator. If None, it will be mindquantum.complex128. Default: None.

Examples

>>> from mindquantum.simulator import NoiseBackend, Simulator
>>> from mindquantum.core.circuit import Circuit, MeasureAccepter, MixerAdder, BitFlipAdder
>>> circ = Circuit().h(0).x(1, 0).measure_all()
>>> circ
      ┏━━━┓       ┍━━━━━━┑
q0: ──┨ H ┠───■───┤ M q0 ├───
      ┗━━━┛   ┃   ┕━━━━━━┙
            ┏━┻━┓ ┍━━━━━━┑
q1: ────────┨╺╋╸┠─┤ M q1 ├───
            ┗━━━┛ ┕━━━━━━┙
>>> adder = MixerAdder([
...     MeasureAccepter(),
...     BitFlipAdder(0.2),
... ], add_after=False)
>>> adder(circ)
      ┏━━━┓       ╔════════════╗ ┍━━━━━━┑
q0: ──┨ H ┠───■───╢ BFC(p=1/5) ╟─┤ M q0 ├───
      ┗━━━┛   ┃   ╚════════════╝ ┕━━━━━━┙
            ┏━┻━┓ ╔════════════╗ ┍━━━━━━┑
q1: ────────┨╺╋╸┠─╢ BFC(p=1/5) ╟─┤ M q1 ├───
            ┗━━━┛ ╚════════════╝ ┕━━━━━━┙
>>> noise_sim = Simulator(NoiseBackend('mqvector', 2, adder=adder))
>>> noise_sim.sampling(circ,seed=42, shots=5000)
shots: 5000
Keys: q1 q0│0.00   0.085        0.17       0.255        0.34       0.425
───────────┼───────────┴───────────┴───────────┴───────────┴───────────┴
         00│▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
           │
         01│▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
           │
         10│▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
           │
         11│▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
           │
{'00': 1701, '01': 796, '10': 804, '11': 1699}