Fast and Robust Quantum Information Transfer in Annular and Radial Superconducting Networks

Abstract

In this paper, we propose a protocol to achieve fast and robustness quantum information transfer (QIT) in annular and radial superconducting networks, where each quantum node is composed of a superconducting quantum interference device (SQUID) inside a coplanar waveguide resonator (CPWR). The process is based on reversely constructing time-dependent control Hamiltonian by designing evolution operator. With the protocol, the maximal population of lossy intermediate states and the amplitudes of pulses can be easily controlled by two corresponding control parameters. Therefore, one can design feasible pulses for QIT with great flexibility. Besides, the speed of the QIT here is much faster compared with that with adiabatic QIT. Moreover, numerical simulations show that the protocol still possesses high fidelity when lossy factors and imperfect operations are taken into account. Therefore, the protocol may provide a useful way to manipulate quantum information networks. IntroductionRealization of quantum information transfer (QIT) between arbitrary remote nodes in a quantum network is one of key elements in the field of quantum information processing (QIP). In the past decade, many QIT protocols have been proposed by means of different techniques, such as the resonant π pulse technique [1,2] and adiabatic passage. [3][4][5][6][7] The resonant π pulse technique [1,2] can be used to transfer quantum information quickly, but it is highly sensitive to the errors of pulse areas. On the other hand, the adiabatic passage [3][4][5][6][7] is insensitive to the influence of imperfect operations, but requires a relatively long interaction time of QIT to meet the adiabatic condition. As a result, the impact of loss and noise would be accumulated, and the intended dynamics may be badly spoiled. Therefore, it raises the requirement of

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Fast generations of entangled states between a transmon qubit and microwave photons via shortcuts to adiabaticity

“…Based on the appealing STA, some optimized controls have been considered for exploring interesting issues with superconducting artificial atoms recently [39][40][41][42]. As one of promising applications, the technique of STA can be effectively employed to speed up population transfers in superconducting two-and three-level systems, which thus provides a highly desirable avenue for performing fast and robust quantum operations on the artificial atoms of SQCs [43][44][45][46].…”

Entanglement Purification of Nonlocal Quantum‐Dot‐Confined Electrons Assisted by Double‐Sided Optical Microcavities

“…Quantum communication is a very promising technique for sending information in an absolutely secure way [1]. Quantum entanglement, as one of the core resources of quantum information, plays an important role in quantum communication, quantum metrology, and distributed quantum computation [2][3][4][5][6][7][8]. However, quantum entanglement could only be created locally and the distribution of quantum entanglement is a prerequisite for various quantum communication protocols, such as quantum key distribution [9][10][11][12], quantum teleportation [13,14], quantum secret sharing [15][16][17], and quantum secure direct communication [18][19][20][21][22][23].…”