Literature DB >> 31633950

Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits.

M A Rol1,2, F Battistel1, F K Malinowski1,2, C C Bultink1,2, B M Tarasinski1,2, R Vollmer1,2, N Haider1,3, N Muthusubramanian1,2, A Bruno1,2, B M Terhal1,4, L DiCarlo1,2.   

Abstract

Conditional-phase (cz) gates in transmons can be realized by flux pulsing computational states towards resonance with noncomputational ones. We present a 40 ns cz gate based on a bipolar flux pulse suppressing leakage (0.1%) by interference and approaching the speed limit set by exchange coupling. This pulse harnesses a built-in echo to enhance fidelity (99.1%) and is robust to long-timescale distortion in the flux-control line, ensuring repeatability. Numerical simulations matching experiment show that fidelity is limited by high-frequency dephasing and leakage by short-timescale distortion.

Year:  2019        PMID： 31633950     DOI： 10.1103/PhysRevLett.123.120502

Source DB:  PubMed          Journal:  Phys Rev Lett        ISSN： 0031-9007            Impact factor:   9.161


  1 in total

1.  Removing leakage-induced correlated errors in superconducting quantum error correction.

Authors:  M McEwen; D Kafri; Z Chen; J Atalaya; K J Satzinger; C Quintana; P V Klimov; D Sank; C Gidney; A G Fowler; F Arute; K Arya; B Buckley; B Burkett; N Bushnell; B Chiaro; R Collins; S Demura; A Dunsworth; C Erickson; B Foxen; M Giustina; T Huang; S Hong; E Jeffrey; S Kim; K Kechedzhi; F Kostritsa; P Laptev; A Megrant; X Mi; J Mutus; O Naaman; M Neeley; C Neill; M Niu; A Paler; N Redd; P Roushan; T C White; J Yao; P Yeh; A Zalcman; Yu Chen; V N Smelyanskiy; John M Martinis; H Neven; J Kelly; A N Korotkov; A G Petukhov; R Barends
Journal:  Nat Commun       Date:  2021-03-19       Impact factor: 14.919
  1 in total

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