qat.quops.make_avg_fid_equiv_depol_channel

qat.quops.make_avg_fid_equiv_depol_channel(rb_eps, nqbits, method_2q='tensor_1q_channels', depol_type='pauli')

Construct depolarizing channel whose average process fidelity \(\mathcal{F}_\mathrm{ave}\) is \(1 - \epsilon_\mathrm{RB}\).

Parameters

  • rb_eps (float) – the n-qbit error rate \(\epsilon_\mathrm{RB}\) (not in percent).

  • nqbits (int) – the number of qubits \(n\).

  • method_2q (string, optional, default to 'tensor_1q_channels') – method to construct the 2-qubit depolarizing channel

  • depol_type (str, optional) – type of depolarizing channel, among ‘pauli’ and ‘randomizing’. Defaults to ‘pauli’.

Returns

the channel

Return type

QuantumChannelKraus

Notes

See documentation of make_depolarizing_channel() for more information on method_2q and depol_type.

Example:

from qat.quops import make_avg_fid_equiv_depol_channel
depol = make_avg_fid_equiv_depol_channel(rb_eps=0.01, nqbits=1)
print(depol)

Depolarizing channel, p = 0.015:
[[0.99247166 0.        ]
 [0.         0.99247166]]
[[0.        +0.j 0.07071068+0.j]
 [0.07071068+0.j 0.        +0.j]]
[[0.+0.j         0.-0.07071068j]
 [0.+0.07071068j 0.+0.j        ]]
[[ 0.07071068+0.j  0.        +0.j]
 [ 0.        +0.j -0.07071068+0.j]]