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Quantum Computing

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Patent US10346761


Issued 2019-07-09

Adiabatic Phase Gates In Parity-based Quantum Computers

Example methods and mechanisms are described herein for implementing and adiabatically operating a topological quantum computing (TQC) phase gate that complements the existing Clifford operations, and thereby allows universal quantum computation with Majorana systems. Further embodiments include a testing system for the phase gate that is feasible with Majorana zero modes and demonstrates violations of the CHSH-Bell inequality. Further, the design used for the testing of the inequality leads directly to a practical platform for performing universal TQC with Majorana wires in which explicit braiding need never occur. Thus, certain embodiments of the disclosed technology involve three synergistically connected aspects of anyonic TQC (in the context of the currently active area of using MZMs for topological quantum computation): a practical phase gate for universal topological quantum computation using MZMs, a precise protocol (using CHSH inequality) for testing that the desired gate operation has been achieved, and bypassing the necessity of MZM braiding (and so avoiding, e.g., problems of nonadiabaticity in the braids).



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2 Independent Claims

  • 1. A quantum circuit phase gate, comprising: a plurality of superconducting components arranged in a ring to form a superconducting loop, wherein adjacent superconducting components are connected to each other via Josephson junctions; a Majorana wire located on a respective one of the superconducting components; and a magnetic field generator configured to apply a variable magnetic field to the superconducting loop formed by the ring of superconductive components.

  • 10. A method of operating a quantum circuit phase gate, comprising: applying a time-varying magnetic field to a set of regions in the quantum circuit phase gate, at least some of the regions being connected to one another via respective Josephson junctions; and controlling a first of the Josephson junctions and a second of the Josephson junctions to create a Josephson vortex in the quantum circuit phase gate as the time-varying magnetic field is applied.