2019/01/11 by Yao Lu, Shuaining Zhang, Kuan Zhang +5 · 2 citations
Computer Science · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Dynamical decoupling #Mechanical and Optical Resonators #Neural Networks and Reservoir Computing #Pairwise comparison #Quantum #Quantum computer #Quantum error correction #Quantum gate #Qubit #Scalability #Topology (electrical circuits) #Trapped ion quantum computer #physics.atom-ph #physics.optics #quant-ph
paper · pdf · doi:10.1038/s41586-019-1428-4
published as Nature 572, 363 (2019) · Main: 7 pages, 4 figures and Methods: 4 pages, 2 figures and 2 tables
arxiv created 2019/01/11 · openalex publication_date 2019/07/24 · openalex created_date 2019/07/30 · arxiv updated 2019/09/30 · openalex updated_date 2026/08/05
A quantum algorithm can be decomposed into a sequence consisting of single qubit and 2-qubit entangling gates. To optimize the decomposition and achieve more efficient construction of the quantum circuit, we can replace multiple 2-qubit gates with a single global entangling gate. Here, we propose and implement a scalable scheme to realize the global entangling gates on multiple \yb ion qubits by coupling to multiple motional modes through external fields. Such global gates require simultaneously decoupling of multiple motional modes and balancing of the coupling strengths for all the qubit-pairs at the gate time. To satisfy the complicated requirements, we develop a trapped-ion system with fully-independent control capability on each ion, and experimentally realize the global entangling gates. As examples, we utilize them to prepare the Greenberger-Horne-Zeilinger (GHZ) states in a single entangling operation, and successfully show the genuine multi-partite entanglements up to four qubits with the state fidelities over 93.4%.