Multi-band topological nanowires
AssigneeMicrosoft Technology Licensing, LLC
InventorsRoman M. Lutchyn, Sankar DasSarma
Life of this patent
Estimating the term…
Abstract
A topological qubit wire hosts Majorana zero-energy modes and includes a superconductor, which may be an s-wave superconductor, and a quasi-1D nanowire, which may be a semi-conductor. The Majorana zero-energy modes are localized at ends of the quasi-1D nanowire, which may be sized and shaped to provide occupancy of a few transverse modes in a first direction and occupancy of a few transverse modes in a second direction. In some instances, the occupancy in the first direction may be greater than or equal to 3, and the occupancy in the second direction may be 1.
Claims20
A topological qubit wire, comprising:
- a superconductor;
- and
- a quasi-1D multi-band nanowire coupled, via quantum tunneling, to the superconductor and having a Majorana segment that supports Majorana zero-energy modes at opposed longitudinal ends of the Majorana segment, wherein the Majorana segment has a longitudinal length extending between the opposed longitudinal ends and a transverse width, and wherein the quantum tunneling between the superconductor and the Majorana segment is non-uniform across the transverse width for at least one portion of the Majorana segment.
A topological qubit wire, comprising:
- an s-wave superconductor;
- a quasi-1D multi-band nanowire coupled, via quantum tunneling, to the s-wave superconductor and having a Majorana segment that supports Majorana zero-energy modes at opposed longitudinal ends of the Majorana segment, wherein the Majorana segment has a longitudinal length extending between the opposed longitudinal ends and a transverse width;
- and
- a non-uniform insulative layer interposing the s-wave superconductor and the quasi-1D multi-band nanowire, wherein the non-uniform insulative layer provides, across the transverse width of the quasi-1D multi-band nanowire, a non-uniform quantum tunneling transmission coefficient between the Majorana segment and the s-wave superconductor for at least one portion of the Majorana segment.
A topological qubit wire, comprising:
- an s-wave superconductor;
- a quasi-1D semiconductor multi-band nanowire coupled, via quantum tunneling, to the s-wave superconductor and having a Majorana segment that supports Majorana zero-energy modes at opposed longitudinal ends of the Majorana segment, wherein the Majorana segment has a longitudinal length extending between the opposed longitudinal ends, a transverse width, and a vertical thickness, wherein the vertical thickness of the quasi-1D semiconductor multi-band nanowire limits occupancy of transverse modes in a vertical direction to one;
- and
- a non-uniform insulative layer interposed between the s-wave superconductor and the quasi-1D semiconductor multi-band nanowire, wherein the non-uniform insulative layer provides, across the transverse width of the quasi-1D semiconductor multi-band nanowire, a non-uniform quantum tunneling transmission coefficient between the Majorana segment and the s-wave superconductor for at least one portion of the Majorana segment.
Dependencies are inferred from the claim text.