Parameterized quantum comb and simpler circuits for reversing unknown qubit-unitary operations

Understand

Quantum combs play a vital role in characterizing and transforming quantum processes, with wide-ranging applications in quantum information processing.

• However, obtaining the explicit quantum circuit for the desired quantum comb remains a challenging problem.
• We propose PQComb, a novel framework that employs parameterized quantum circuits (PQCs) or quantum neural networks to harness the full potential of quantum combs for diverse quantum process transformation tasks.
• This method is well-suited for near-term quantum devices and can be applied to various tasks in quantum machine learning.