Fast generation of W states of superconducting qubits with multiple Schrödinger dynamics

Abstract

In this paper, we present a protocol to generate a W state of three superconducting qubits (SQs) by using multiple Schrödinger dynamics. The three SQs are respective embedded in three different coplanar waveguide resonators (CPWRs), which are coupled to a superconducting coupler (SCC) qubit at the center of the setups. With the multiple Schrödinger dynamics, we build a shortcuts to adiabaticity (STA), which greatly accelerates the evolution of the system. The Rabi frequencies of the laser pulses being designed can be expressed by the superpositions of Gaussian functions via the curves fitting, so that they can be realized easily in experiments. What is more, numerical simulation result shows that the protocol is robust against control parameters variations and decoherence mechanisms, such as the dissipations from the CPWRs and the energy relaxation. In addition, the influences of the dephasing are also resisted on account of the accelerating for the dynamics. Thus, the performance of the protocol is much better than that with the conventional adiabatic passage techniques when the dephasing is taken into account. We hope the protocol could be implemented easily in experiments with current technology.

Generation of quantum entangled states of multiple groups of qubits distributed in multiple cavities

“…), which are placed in a single cavity or coupled to a single resonator [23][24][25][26][27][28][29][30][31]. Moreover, proposals have been presented to entangle qubits distributed in different cavities [32][33][34][35][36][37][38][39][40][41][42]. Note that the previous methods presented for entangling qubits in a single cavity or resonator may not be applied to entangle qubits that are distributed in different cavities, and the previous proposals for entangling qubits in different cavities are not universal, which depend on the specific cavity-system architecture and the way in which the cavities are connected.…”

Non-locality Correlation in Two Driven Qubits Inside an Open Coherent Cavity: Trace Norm Distance and Maximum Bell Function

“…Due to the rapid development of experiments in macroscopic solid state physics, the artificial two-level atoms qubits based on the superconducting (SC) circuits 5,6 and quantum dots (QDs) 7 have been recognized as possible candidate for quantum processing. The SC-qubits have macroscopic quantum coherence.…”

Fast and robust population transfer with a Josephson qutrit via shortcut to adiabaticity

“…Alternatively, the exploration of fast QPT within a shorter time is highly preferable to diminish the decoherence effects. Based on the technique of STA, many valuable strategies for accelerating quantum operations with Josephson quantum circuits have been studied increasingly 42 – 45 . Very recently, an efficient protocol has been proposed for speeding up QPT in a transmon qutrit via the invariant-based shortcut 46 , in which a Λ-type qutrit was reduced into an effective two-level system after adiabatically eliminating the intermediate state in the large detuning regime.…”