High-fidelity quantum state transfer using Cooper-pair box qubits

Speeding up adiabatic population transfer in a Josephson qutrit via counter-diabatic driving

“…The suitable level structure is very helpful to implement the robust quantum manipulation. (iv) Different from the previous works [21,35,60], the present three-level system is selected at the magic point of n 0.5 d = , which contributes to remove the dephasing effect and then to prolong the system decoherence time greatly. (v) During the accelerated and reversible transfer process, the intermediate state añ | is almost not populated within the operation time, which makes the robust inversion insensitive to spontaneous emission caused by añ | .…”

“…Therefore, the realization of faster population transfer is highly sought after [22,[30][31][32] and from which the desired quantum operation can be performed within a shorter time and decoherence effects can be greatly reduced. Another key point related to optimal QPT is the reversible transferring quantum state [33][34][35], which is a requisite for the storage and retrieval of quantum information.…”