Quantum information processing with majorana bound states in superconducting circuits
Abstract
In a weak link of two swave superconductors (SCs) coupled via a timereversalinvariant (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 paritycontrolled Josephson effect can be used as a readout mechanism for the joint parity in Majoranabased 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 singlequbit operations, qubit readout, as well as twoqubit entangling gates. Hence, TSC islands between SC leads may provide an alternative approach to superconducting quantum computation.
 Inventors:
 Issue Date:
 Research Org.:
 Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1637844
 Patent Number(s):
 10593879
 Application Number:
 16/244,176
 Assignee:
 Massachusetts Institute of Technology (Cambridge, MA)
 Patent Classifications (CPCs):

H  ELECTRICITY H01  BASIC ELECTRIC ELEMENTS H01L  SEMICONDUCTOR DEVICES
G  PHYSICS G06  COMPUTING G06N  COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS
 DOE Contract Number:
 SC0010526
 Resource Type:
 Patent
 Resource Relation:
 Patent File Date: 01/10/2019
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Schrade, Constantin, and Fu, Liang. Quantum information processing with majorana bound states in superconducting circuits. United States: N. p., 2020.
Web.
Schrade, Constantin, & Fu, Liang. Quantum information processing with majorana bound states in superconducting circuits. United States.
Schrade, Constantin, and Fu, Liang. Tue .
"Quantum information processing with majorana bound states in superconducting circuits". United States. https://www.osti.gov/servlets/purl/1637844.
@article{osti_1637844,
title = {Quantum information processing with majorana bound states in superconducting circuits},
author = {Schrade, Constantin and Fu, Liang},
abstractNote = {In a weak link of two swave superconductors (SCs) coupled via a timereversalinvariant (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 paritycontrolled Josephson effect can be used as a readout mechanism for the joint parity in Majoranabased 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 singlequbit operations, qubit readout, as well as twoqubit entangling gates. Hence, TSC islands between SC leads may provide an alternative approach to superconducting quantum computation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {3}
}