Abstract
Stimulated Raman adiabatic passage (STIRAP) is a widely used protocol to realize high-fidelity and robust quantum control in various quantum systems. However, further application of this protocol in superconducting qubits is limited by population leakage caused by the only weak anharmonicity. Here, we introduce an optimally controlled shortcut-to-adiabatic (STA) technique to speed-up the STIRAP protocol in a superconducting qudit. By modifying the shapes of the STIRAP pulses, we experimentally realize a fast (32 ns) and high-fidelity (0.996 ± 0.005) quantum state transfer. In addition, we demonstrate that our protocol is robust against control parameter perturbations. Our stimulated Raman shortcut-to-adiabatic passage transition provides an efficient and practical approach for quantum information processing.
Highlights
Adiabatic passage techniques have been widely used to achieve reliable quantum control in quantum information processing. Among these techniques, stimulated Raman adiabatic passage (STIRAP) has achieved great success in physics, chemistry and beyond, since it was introduced by Gaubatz et al.[1–8]
In a STIRAP scheme, the system Hamiltonian evolves adiabatically, so that its evolutionary trajectory is insensitive to the loss channel and noise[17–19]
The implementation of STIRAP is constrained by the strict adiabatic condition[2,20–25], which is usually not feasible for superconducting qubits due to their fast decoherence caused by strong coupling with the environment[26–29]
Summary
Adiabatic passage techniques have been widely used to achieve reliable quantum control in quantum information processing. In a STIRAP scheme, the system Hamiltonian evolves adiabatically, so that its evolutionary trajectory is insensitive to the loss channel and noise[17–19] This feature makes the approach important for future implementations of deterministic multi-qubit entanglement in quantum communication or computing networks based on superconducting circuits. For adiabatic quantum processes including STIRAP, in addition to combining composite pulses to enhance robustness while ensuring high fidelity[30–35], various shortcut-to-adiabatic (STA) protocols have been theoretically and experimentally studied[36–38], including counter-diabatic (CD) driving[23–25,39–41], invariants and scaling laws[42–45], variational methods[46,47], and fast forward[48,49]. Introducing these STA protocols in STIRAP (known as STIRSAP)
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