Kazuki Koshino

A whisper in a noisy room is nearly indistinguishable. A conventional amplifier adds its own noise and drowns out the weak sound. A quantum amplifier works differently: it amplifies the signal while adding almost no extra noise, like a perfect ear. But even such an ear has its own problems.

A quantum computer is like an orchestra where every musician-qubit must play in perfect silence. But when you have many such orchestras that want to perform together, they need a reliable conductor-communicator.