Overhead for simulating a non-local channel with local channels by quasiprobability sampling

Understand

As the hardware technology for quantum computing advances, its possible applications are actively searched and developed.

• However, such applications still suffer from the noise on quantum devices, in particular when using two-qubit gates whose fidelity is relatively low.
• One way to overcome this difficulty is to substitute such non-local operations by local ones.
• Such substitution can be performed by decomposing a non-local channel into a linear combination of local channels and simulating the original channel with a quasiprobability-based method.