Topological superconductor from superconducting topological surface
states and fault-tolerant quantum computing
- URL: http://arxiv.org/abs/2003.11752v1
- Date: Thu, 26 Mar 2020 06:07:06 GMT
- Title: Topological superconductor from superconducting topological surface
states and fault-tolerant quantum computing
- Authors: Xi Luo, Yu-Ge Chen, Ziqiang Wang, Yue Yu
- Abstract summary: A widely believed chiral $p$-wave superfluid is the Moore-Read state in the $nu=frac52$ fractional quantum Hall effect.
Here we report a new mechanism for realizing 2D chiral $p$-wave superconductors on the surface of 3D $s$-wave superconductors.
- Score: 6.394072140094434
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The chiral $p$-wave superconductor/superfluid in two dimensions (2D) is the
simplest and most robust system for topological quantum computation .
Candidates for such topological superconductors/superfluids in nature are very
rare. A widely believed chiral $p$-wave superfluid is the Moore-Read state in
the $\nu=\frac{5}2$ fractional quantum Hall effect, although experimental
evidence are not yet conclusive. Experimental realizations of chiral $p$-wave
superconductors using quantum anomalous Hall insulator-superconductor hybrid
structures have been controversial. Here we report a new mechanism for
realizing 2D chiral $p$-wave superconductors on the surface of 3D $s$-wave
superconductors that have a topological band structure and support
superconducting topological surface states (SC-TSS), such as the iron-based
superconductor Fe(Te,Se). We find that tunneling and pairing between the SC-TSS
on the top and bottom surfaces in a thin film or between two opposing surfaces
of two such superconductors can produce an emergent 2D time-reversal symmetry
breaking chiral topological superconductor. The topologically protected anyonic
vortices with Majorana zero modes as well as the chiral Majorana fermion edge
modes can be used as a platform for more advantageous non-abelian braiding
operations. We propose a novel device for the CNOT gate with six chiral
Majorana fermion edge modes, which paves the way for fault-tolerant universal
quantum computing.
Related papers
- Cooper quartets designing in multi-terminal superconducting devices [49.1574468325115]
Quantum design of Cooper quartets in a double quantum dot system coupled to ordinary superconducting leads is presented.
A fundamentally novel, maximally correlated ground state emerges in the form of a superposition of vacuum $|0rangle$ and four-electron state $|4erangle$.
The results open the way to the exploration of correlation effects and non-local coherence in hybrid superconducting devices, parity-protected quantum computing schemes and more generally.
arXiv Detail & Related papers (2024-01-08T19:28:15Z) - Theory of $d + id$ Second-Order Topological Superconductors [9.85377596401486]
We study the realization of second-order topology that defines anomalous gapless boundary modes in a two-orbital superconductor.
We reveal a time-reversal symmetry-breaking second-order topological superconducting phase with $d+id$-wave orbital-dependent paring.
Our work not only reveals a unique mechanism of time-reversal symmetry breaking second-order topological superconductors but also bridges the gap between second-order topology and orbital-dependent pairings.
arXiv Detail & Related papers (2023-10-27T09:06:12Z) - Microscopic scale of pair-breaking quantum phase transitions in
superconducting films, nanowires and La$_{1.92}$Sr$_{0.08}$CuO$_{4}$ [0.0]
superconducting ground state can be created and destroyed through quantum phase transitions.
Quantum phase transitions are driven by non-thermal parameters such as the carrier density or magnetic field.
In this work, we find that the pair-breaking mechanism causing the suppression of the Cooper pair density gives a unifyingly consistent description of magnetic-field-driven QPTs.
arXiv Detail & Related papers (2023-09-01T21:55:23Z) - Superconductivity in a Topological Lattice Model with Strong Repulsion [1.1608869880392607]
We introduce a minimal 2D lattice model that incorporates time-reversal symmetry, band topology, and strong repulsive interactions.
We demonstrate that it is formed from the weak pairing of holes atop the QSH insulator.
Motivated by this, we elucidate structural similarities and differences between our model and those of TBG in its chiral limit.
arXiv Detail & Related papers (2023-08-21T18:00:01Z) - Majorana bound states in d-wave superconductor planar Josephson junction [0.0]
We study phase-controlled Josephson junctions comprising a two-dimensional electron gas with strong spin-orbit coupling and d-wave superconductors.
We show that a region between the two superconductors can be tuned into a topological state by the in-plane Zeeman field, and can host Majorana bound states.
arXiv Detail & Related papers (2023-07-27T19:36:42Z) - Fragmented superconductivity in the Hubbard model as solitons in
Ginzburg-Landau theory [58.720142291102135]
Superconductivity and charge density waves are observed in close vicinity in strongly correlated materials.
We investigate the nature of such an intertwined state of matter stabilized in the phase diagram of the elementary $t$-$tprime$-$U$ Hubbard model.
We provide conclusive evidence that the macroscopic wave functions of the superconducting fragments are well-described by soliton solutions of a Ginzburg-Landau equation.
arXiv Detail & Related papers (2023-07-21T18:00:07Z) - Topological Superconductivity in Two-Dimensional Altermagnetic Metals [1.779681639954815]
We study the effect of altermagnetism on the superconductivity of a two-dimensional metal with d-wave altermagnetism and Rashba spin-orbital coupling.
We show that a number of topological superconductors, including both first-order and second-order ones, can emerge when the p-wave pairing dominates.
arXiv Detail & Related papers (2023-05-17T18:00:00Z) - Higher-order topological Peierls insulator in a two-dimensional
atom-cavity system [58.720142291102135]
We show how photon-mediated interactions give rise to a plaquette-ordered bond pattern in the atomic ground state.
The pattern opens a non-trivial topological gap in 2D, resulting in a higher-order topological phase hosting corner states.
Our work shows how atomic quantum simulators can be harnessed to investigate novel strongly-correlated topological phenomena.
arXiv Detail & Related papers (2023-05-05T10:25:14Z) - Quantum Sensors for Microscopic Tunneling Systems [58.720142291102135]
tunneling Two-Level-Systems (TLS) are important for micro-fabricated quantum devices such as superconducting qubits.
We present a method to characterize individual TLS in virtually arbitrary materials deposited as thin-films.
Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects.
arXiv Detail & Related papers (2020-11-29T09:57:50Z) - Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control.
We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap.
The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
arXiv Detail & Related papers (2020-06-05T09:27:53Z) - Optimal coupling of HoW$_{10}$ molecular magnets to superconducting
circuits near spin clock transitions [85.83811987257297]
We study the coupling of pure and magnetically diluted crystals of HoW$_10$ magnetic clusters to microwave superconducting coplanar waveguides.
Results show that engineering spin-clock states of molecular systems offers a promising strategy to combine sizeable spin-photon interactions with a sufficient isolation from unwanted magnetic noise sources.
arXiv Detail & Related papers (2019-11-18T11:03:06Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.