Adiabatic passage for one-step generation of n-qubit Greenberger–Horne–Zeilinger states of superconducting qubits via quantum Zeno dynamics

Wu, Jin‐Lei; Song, Chong; Xu, Jing‐Bo; Yu, Lin; Ji, Xin; Zhang, Shou

doi:10.1007/s11128-016-1366-0

Cited by 18 publications

(19 citation statements)

References 47 publications

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“…On the experimental front, tripartite entanglement was generated using photonic qubits and the robustness of W state entanglement was studied in optical systems [13][14][15][16]. The dynamics of multi-qubit entanglement under the influence of decoherence was experimentally characterized using a string of trapped ions [17] and in superconducting qubits [18]. In the context of NMR quantum information processing, three-qubit entangled states were experimentally prepared [19][20][21], and their decay rates compared with bipartite entangled states [22].…”

Section: Introductionmentioning

confidence: 99%

Evolution of tripartite entangled states in a decohering environment and their experimental protection using dynamical decoupling

2018

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We embarked upon the task of experimental protection of different classes of tripartite entangled states, namely the maximally entangled GHZ and W states and the WW state, using dynamical decoupling. The states were created on a three-qubit NMR quantum information processor and allowed to evolve in the naturally noisy NMR environment. Tripartite entanglement was monitored at each time instant during state evolution, using negativity as an entanglement measure. It was found that the W state is most robust while the GHZ-type states are most fragile against the natural decoherence present in the NMR system. The WW state which is in the GHZ-class, yet stores entanglement in a manner akin to the W state, surprisingly turned out to be more robust than the GHZ state. The experimental data were best modeled by considering the main noise channel to be an uncorrelated phase damping channel acting independently on each qubit, alongwith a generalized amplitude damping channel. Using dynamical decoupling, we were able to achieve a significant protection of entanglement for GHZ states. There was a marginal improvement in the state fidelity for the W state (which is already robust against natural system decoherence), while the WW state showed a significant improvement in fidelity and protection against decoherence.

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Section: Introductionmentioning

confidence: 99%

Evolution of tripartite entangled states in a decohering environment and their experimental protection using dynamical decoupling

2018

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“…Till now, the generation of the W states has been studied in numerous systems242526272829303132333435, such as the atom-cavity coupled systems242526, electronic spin qubits inside the quantum dots systems27, photons and linear optical systems2829, superconducting qubits (SQs) systems30313233343536, etc. Among of these protocols24252627282930313233343536, the generation of W states with SQs has shown fantastic advantages, since new progress in circuit cavity quantum electrodynamics makes it a standout performance among the most promising candidates for implementing QIP3738.…”

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confidence: 99%

“…Among of these protocols24252627282930313233343536, the generation of W states with SQs has shown fantastic advantages, since new progress in circuit cavity quantum electrodynamics makes it a standout performance among the most promising candidates for implementing QIP3738. It has been shown that, the SQs (e.g., flux, phase and charge qubits) and microwave resonators can be manufactured using modern integrated circuit technology, their features can be characterized and adjusted in situ .…”

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confidence: 99%

“…During a long evolution, the dissipations may accumulate and finally destroy the intended dynamics. For example, refs 31 and 36 has shown that, the fidelity for generating of the W state by using adiabatic passage is quite sensitive to the dephasing, which is an ineluctable element of the decoherence mechanisms in the superconducting systems, i.e., a small increase of the dephasing rates causes a large decrease of the fidelity; this will also bring challenges to the experiments. Therefore, to overcome the problem causing by the long evolution time of the adiabatic passage, one should speed up the evolution by using some other techniques.…”

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confidence: 99%

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

Kang

Chen

et al. 2016

Sci Rep

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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.

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“…the preparation of multi-qubit W states was achieved by Wei et al in 2015 [18]; n-qubit GHZ states were implemented in 2016 [19].…”

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confidence: 99%

Rapid generation of a three-dimensional entangled state for two atoms trapped in a cavity via shortcuts to adiabatic passage

Yang

Chen

et al. 2016

Quantum Inf Process

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An experimentally feasible scheme is proposed for rapidly generating twoatom three-dimensional (3D) entanglement with one step. As one technique of shortcuts to adiabaticity, transitionless quantum driving is applied to speed up the adiabatic generation of two-atom 3D entanglement. Apart from the rapid rate, the scheme has much higher experimental feasibility than the recent research (Quant.Inf. Process. ). Besides, numerical simulations indicate the scheme has strong robustness against parameter deviations and decoherence.

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Adiabatic passage for one-step generation of n-qubit Greenberger–Horne–Zeilinger states of superconducting qubits via quantum Zeno dynamics

Cited by 18 publications

References 47 publications

Evolution of tripartite entangled states in a decohering environment and their experimental protection using dynamical decoupling

Evolution of tripartite entangled states in a decohering environment and their experimental protection using dynamical decoupling

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

Rapid generation of a three-dimensional entangled state for two atoms trapped in a cavity via shortcuts to adiabatic passage

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