Shadow process tomography of quantum channels

Understand

Quantum process tomography is a critical capability for building quantum computers, enabling quantum networks, and understanding quantum sensors.

• Like quantum state tomography, the process tomography of an arbitrary quantum channel requires a number of measurements that scale exponentially in the number of quantum bits affected.
• However, the recent field of shadow tomography, applied to quantum states, has demonstrated the ability to extract key information about a state with only polynomially many measurements.
• In this work, we apply the concepts of shadow state tomography to the challenge of characterizing quantum processes.