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Title:
QUANTUM INFORMATION PROCESSING WITH MAJORANA BOUND STATES IN SUPERCONDUCTING CIRCUITS
Document Type and Number:
WIPO Patent Application WO/2019/140031
Kind Code:
A3
Abstract:
In a weak link of two s-wave superconductors (SCs) coupled via a time-reversal-invariant (TRI) topological superconducting (TSC) island, a Josephson current can flow due to Cooper pairs tunneling in and out of spatially separated Majorana Kramers pairs (MKPs), which are doublets of Majorana bound states (MBSs). The sign of the resulting Josephson current is fixed by the joint parity of the four Majorana bound states that make up the MKPs on the TSC island. This parity-controlled Josephson effect can be used as a read-out mechanism for the joint parity in Majorana-based quantum computing. For a TSC island with four terminals, the SC leads can address a Majorana superconducting qubit (MSQ) formed by the charge ground states of the TSC island's terminals. Cooper pair splitting enables single-qubit operations, qubit read-out, as well as two-qubit entangling gates. Hence, TSC islands between SC leads may provide an alternative approach to superconducting quantum computation.

Inventors:
FU LIANG (US)
SCHRADE CONSTANTIN (US)
Application Number:
PCT/US2019/012964
Publication Date:
September 19, 2019
Filing Date:
January 10, 2019
Export Citation:
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Assignee:
MASSACHUSETTS INST TECHNOLOGY (US)
FU LIANG (US)
SCHRADE CONSTANTIN (US)
International Classes:
H01L39/22; B82Y10/00; H01L39/24
Foreign References:
US20120112168A12012-05-10
US20170133576A12017-05-11
US20170141287A12017-05-18
Other References:
LIU ET AL.: "Non-Abelian Majorana Doublets in Time-Reversal-Invariant Topological Superconductors", PHYSICAL REVIEW X, vol. 4, no. 2, 021018, 2014, XP055642979, Retrieved from the Internet
KITAEV: "Unpaired Majorana fermions in quantum wires", PHYSICS-USPEKHI, 27 October 2000 (2000-10-27), XP080031302, Retrieved from the Internet
FLENSBERG: "Tunneling characteristics of a chain of Majorana bound states", PHYSICAL REVIEW B., vol. 82, no. 18, 180516, 2010, XP080449650
Attorney, Agent or Firm:
COLICE, Christopher, Max et al. (US)
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