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arXiv:1512.03026 · Physical Review Letters

Speeding up Adiabatic Quantum State Transfer by Using Dressed States

Alexandre Baksic, Hugo Ribeiro, Aashish A. Clerk

Published Jun 9, 2016• 261 citations
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Abstract

We develop new pulse schemes to significantly speed up adiabatic state transfer protocols. Our general strategy involves adding corrections to an initial control Hamiltonian that harness nonadiabatic transitions. These corrections define a set of dressed states that the system follows exactly during the state transfer. We apply this approach to stimulated Raman adiabatic passage protocols and show that a suitable choice of dressed states allows one to design fast protocols that do not require additional couplings, while simultaneously minimizing the occupancy of the "intermediate" level.

DOI
10.1103/physrevlett.116.230503

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We develop new pulse schemes to significantly speed up adiabatic state transfer protocols. Our general strategy involves adding corrections to an initial control Hamiltonian that harness nonadiabatic transitions. These corrections define a set of dressed states that the system follows exactly during the state transfer. We apply this approach to stimulated Raman adiabatic passage protocols and show that a suitable choice of dressed states allows one to design fast protocols that do not require additional couplings, while simultaneously minimizing the occupancy of the "intermediate" level.
We propose a scheme which can produce desired nonadiabatic passages for the stimulated Raman transition in three-level systems. The state transfer in the protocol is realized by following the evolution of the dynamical basis itself and no additional coupling field is required. We also investigate the interplay between the present nonadiabatic passages and the shortcut to adiabaticity. By incorporating the latter technology, we show that alternative passages with less occupancy of the intermediate level could be designed.
Abstract Stimulated Raman adiabatic passage (STIRAP) is a widely used technique for efficient population transfer between quantum states. However, the adiabatic nature of STIRAP requires slow evolution, leading to long operation times, which limits its practical applications. The superadiabatic method has been introduced to accelerate the STIRAP process, but it often necessitates additional couplings between the initial and target states, which may not be available in the original Hamiltonian. In this work, we present a novel approach to implement superadiabatic STIRAP (sa-STIRAP) between dressed states in a three-level quantum system. By modulating the amplitude and phase of the original driving fields, the initial and target states in dressed-state space can be effectively coupled. This approach provides a practical means of realizing sa-STIRAP in experimental setups, making it convenient to accelerate adiabatic quantum state transfer.
The difficulty in combining high fidelity with fast operation times and robustness against sources of noise is the central challenge of most quantum control problems, with immediate implications for the realization of quantum devices. We theoretically propose a protocol, based on the widespread stimulated Raman adiabatic passage technique, which achieves these objectives for quantum state transfers in generic three-level systems. Our protocol realizes accelerated adiabatic following through the application of additional control fields on the optical excitations. These act along frequency sidebands of the principal adiabatic pulses, dynamically counteracting undesired transitions. The scheme facilitates experimental control, not requiring new hardly-accessible resources. We show numerically that the method is efficient in a very wide set of control parameters, bringing the timescales closer to the quantum speed limit, also in the presence of environmental disturbance. These results hold for complete population transfers and for many applications, e.g., for realizing quantum gates, both for optical and microwave implementations. Furthermore, extensions to adiabatic passage problems in more-level systems are straightforward.
We propose a scheme to speed up adiabatic passage by using Lyapunov control theory. This is a good choice to solve the problem that may emerge in Berry's transitionless quantum driving [M. V. Berry, J. Phys. A 42, 365303 (2009)]. That is, the extra couplings in the counterdiabatic driving Hamiltonian can be avoided by choosing the available control Hamiltonian in an actual physical system. As examples, we shorten the evolution time of adiabatic population transfer in a three-level system and the entanglement generation in a cavity quantum electrodynamics system. Moreover, the occupation of an intermediate state can be sharply suppressed by properly choosing the control Hamiltonian in the three-level system. The scheme can also be generalized to a complex system where the exact expressions of adiabatic eigenstates are difficult to obtain.
Stimulated Raman adiabatic passage (STIRAP) and its superadiabatic variant (sa-STIRAP) are pivotal techniques for high-fidelity quantum state transfer. However, STIRAP is inherently slow, while sa-STIRAP often requires additional, experimentally challenging couplings. Recent progress has shown that implementing these protocols in the dressed-state space can overcome these limitations by modulating the amplitude and phase of native driving fields, thereby enabling efficient population transfer without extra couplings. Nevertheless, the robustness of these dressed-state protocols against decoherence remains unclear. In this work, we investigate the decoherence resilience of both STIRAP and sa-STIRAP within the dressed-state framework. Through numerical simulations, we demonstrate that they exhibit significantly enhanced robustness to environmental noise compared to their standard three-level counterparts. Our results highlight the potential of dressed-state-based protocols for achieving robust, high-fidelity quantum state transfer in noisy environments.
Motivated by the progress on shortcuts to adiabaticity, we propose three schemes for speeding up (fractional) stimulated Raman adiabatic passage, and achieving rapid and non-adiabatic creation and transfer of maximal coherence in a triple-quantum-dot system. These different but relevant protocols, designed from counter-diabatic driving, dress-state method, and resonant technique, require their own pumping fields, applied gate voltages and varying tunneling couplings between two spatially separated dots. Such fast and reliable shortcuts not only allow for feasibly experimental realization in solid-state architectures but also may have potential applications in quantum information processing and quantum control.