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Robust two-qubit gates for exchange-coupled qubits
We present composite pulse sequences that perform fault-tolerant two-qubit gate operations on exchange-only quantum dot spin qubits in various experimentally relevant geometries. We show how to…
Proposal for geometric generation of a biexciton in a quantum dot using a chirped pulse
We propose to create a biexciton in a quantum dot by a coherent optical process using a frequency-sweeping (chirped) laser pulse. In contrast to the two-photon Rabi flop scheme, the present method…
Odd-parity superconductivity from phonon-mediated pairing
Motivated by the proposed topological state in CuxBi2Se3, we study the possibility of phononmediated odd-parity superconductivity in spin-orbit coupled systems with time-reversal and inversion…
Superfluidity in the absence of kinetics in spin-orbit-coupled optical lattices
At low temperatures bosons typically condense to minimize their single-particle kinetic energy while interactions stabilize superfluidity. Optical lattices with artificial spin-orbit coupling…
Soft superconducting gap in semiconductor Majorana nanowires.
- S. Takei, Benjamin M. Fregoso, H. Hui, A. Lobos, S. Das Sarma
- PhysicsPhysical review letters
- 5 November 2012
This work indicates that improving the quality of the superconductor-semiconductor interface should result in a harder induced gap, and systematically studies the effects of magnetic and nonmagnetic disorder, temperature, dissipative Cooper pair breaking, and interface inhomogeneity which could lead to a soft gap.
Topological Yu-Shiba-Rusinov chain from spin-orbit coupling
We investigate the possibility of realizing a topological state in the impurity band formed by a chain of classical spins embedded in a two-dimensional singlet superconductor with Rashba spin-orbit…
Odd-parity superconductivity from phonon-mediated pairing: Application to Cu x Bi 2 Se 3
Motivated by the proposed topological state in Cu$_x$Bi$_2$Se$_3$, we study the possibility of phonon-mediated odd-parity superconductivity in spin-orbit coupled systems with time-reversal and…
Majorana fermions in ferromagnetic chains on the surface of bulk spin-orbit coupled s-wave superconductors
It is shown that a ferromagnetic chain deposited on the surface of a spin-orbit coupled s-wave superconductor generically supports zero-energy topological MF excitations near the two ends of the chain with minimal fine-tuning.
Disorder-induced subgap states and Majorana zero-energy edge modes in two-dimensional topological insulator-superconductor hybrid structures
Contrary to the widespread belief that Majorana zero-energy modes, existing as bound edge states in 2D topological insulator (TI)-superconductor (SC) hybrid structures, are unaffected by non-magnetic…
Bulk disorder in the superconductor affects proximity-induced topological superconductivity
We investigate effects of ordinary nonmagnetic disorder in the bulk of a superconductor on magnetic adatom-induced Shiba states and on the proximity-induced superconductivity in a nanowire that is…