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Quantum Information Processing

Shortcuts to adiabaticity for rapidly generating two-atom qutrit entanglement

Rui Peng, Yue Zheng, Si-Wen Liu, Xiao-Pan Li, Jin‐Lei Wu, Xin Ji

Published May 27, 2017• 12 citations
Publisher
DOI
10.1007/s11128-017-1623-x

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Abstract Optimal generation of entangled states is of critical significance for robust quantum information processing. An effective scheme is presented for speeding up the generation of an entangled state between a superconducting qubit and microwave photons via counterdiabatic driving. At a magic bias point, the first three levels of a charge‐phase quantum circuit constitute an effective qutrit. An entangled state based on adiabatic population transfer is first achieved. By the technique of shortcuts to adiabaticity, a counterdiabatic driving is applied to the qutrit, which then accelerates the entanglement generation significantly. Moreover, with the accessible decoherence rates, the rapid operations in a shortcut way are highly robust when compared with adiabatic manipulations. The scheme could offer a promising approach toward optimal preparation of entangled states with superconducting artificial atoms in circuit quantum electrodynamics, experimentally.
NOON states play an important role in quantum information processing and quantum metrology, but the fidelities of these states generated previously are limited, typically by the practically unavoidable decoherence and operational imperfections. Here, we propose an efficient scheme to generate photonic NOON states alternatively using the rapid population passage technique via the shortcut to adiabaticity (STA), rather than the usual Rabi oscillations. Since the deterministic population passages based on the STAs are insensitive to the details of the operations and can be implemented as fast as the Rabi oscillations, the fidelity of the generated NOON state could be satisfactorily high. The feasibility of the proposal is demonstrated specifically with the experimental circuit QED systems by rapidly driving two artificial qutrits.