Experimental Implementation of Short-Path Nonadiabatic Geometric Gates in a Superconducting Circuit

Yang, Xin-Xin; Guo, Liang-Liang; Zhang, Hai-Feng; Du, Lei; Zhang, Chi; Tao, Haoran; Chen, Yong; Duan, Peng; Jia, Zhimin; Kong, Weicheng; Guo, Guo-Ping

doi:10.1103/physrevapplied.19.044076

Cited by 9 publications

(2 citation statements)

References 86 publications

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“…Secondly, by transforming χ err noSPAM into its diagonal form Λ , as shown in Fig. 4(c), the decoherence error can be extracted, [31,32] ε dec = 1−Λ II = 3.06%, which indicates that the infidelity of our quantum state transfer process primarily comes from the decoherence error, agreeing well with the numerical result. Moreover, we extract the relaxation time T 1 = 6.0 µs and dephasing time T 2 = 1.5 µs of the transferred state from the experiment data for the initial state prepared in |e and (|g + |e ) / √ 2, respectively.…”

Section: -3supporting

confidence: 78%

Fast and perfect state transfer in superconducting circuit with tunable coupler

Zhang 张,

Wang 王,

Zhao 赵

et al. 2023

Chinese Phys. B

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In quantum computation and quantum information processing, the manipulation and engineering of quantum systems to suit certain purposes are an ongoing task. One such example is quantum state transfer (QST), an essential requirement for both quantum communication and large-scale quantum computation. Here we engineer a chain of four superconducting qubits with tunable couplers to realize the perfect state transfer (PST) protocol originally proposed in quantum spin networks and successfully demonstrate the efficient transfer of an arbitrary single-qubit state from one end of the chain to the other, achieving a high fidelity of 0.986 in just 25 ns. This demonstrated QST is readily to extend to larger chain and multi-node configurations, thus serving as a desirable tool for scalable quantum information processing.

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Section: -3supporting

confidence: 78%

Fast and perfect state transfer in superconducting circuit with tunable coupler

Zhang 张,

Wang 王,

Zhao 赵

et al. 2023

Chinese Phys. B

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“…We use the endmost qubit of a tunable six-Xmon-qubit-chain device to probe the TLS defects [38,39] as shown in Figure 1a. The qubit is made of aluminum on silicon, with a large shunt capacitor to decouple the charge noise.…”

Section: Device and Methodsmentioning

confidence: 99%

Locating Two-Level Systems in a Superconducting Xmon Qubit

Yang

Guo

et al. 2023

Applied Sciences

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One significant source of decoherence in superconducting circuits is known as two-level systems (TLSs), found in amorphous oxide layers. These circuits can, however, also be utilized as spectral and temporal TLS probes. Comprehensive investigations on the physics of TLSs are now possible thanks to recent advancements in superconducting qubits. Here, we simultaneously measure the tunable Xmon qubit decoherence time as well as the resonance frequency for more than 3 days to investigate stochastic fluctuations. Time-domain Allan deviation and frequency-domain power spectral density analysis indicate that two TLSs in near resonance with the qubit are responsible for the fluctuations. From the extracted oscillation in T1 decay, we locate the two TLSs near the junctions.

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