How valley-orbit states in silicon quantum dots probe quantum well interfaces

• URL: http://arxiv.org/abs/2103.14702v2
• Date: Wed, 6 Apr 2022 17:22:23 GMT
• Title: How valley-orbit states in silicon quantum dots probe quantum well interfaces
• Authors: J. P. Dodson, H. Ekmel Ercan, J. Corrigan, Merritt Losert, Nathan Holman, Thomas McJunkin, L. F. Edge, Mark Friesen, S. N. Coppersmith, M. A. Eriksson
• Abstract summary: We report measurements of one- and two-electron valley-orbit state energies as the dot potential is modified by changing gate voltages. The results enable an understanding of the interplay between the physical contributions and enable a new probe of the quantum well interface.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The energies of valley-orbit states in silicon quantum dots are determined by an as yet poorly understood interplay between interface roughness, orbital confinement, and electron interactions. Here, we report measurements of one- and two-electron valley-orbit state energies as the dot potential is modified by changing gate voltages, and we calculate these same energies using full configuration interaction calculations. The results enable an understanding of the interplay between the physical contributions and enable a new probe of the quantum well interface.

Related papers

• Bound state of distant photons in waveguide quantum electrodynamics [137.6408511310322]
  Quantum correlations between distant particles remain enigmatic since the birth of quantum mechanics. We predict a novel kind of bound quantum state in the simplest one-dimensional setup of two interacting particles in a box. Such states could be realized in the waveguide quantum electrodynamics platform.
  arXiv  Detail & Related papers  (2023-03-17T09:27:02Z)
• Quantum State Transfer: Interplay between Gate and Readout Errors [0.0]
  We simulate quantum state transfer between two nodes connected in a linear geometry through other nodes. We find that the nominal success probability is not necessarily a monotonic function of the two error rates.
  arXiv  Detail & Related papers  (2022-09-15T03:22:40Z)
• Tunable photon-mediated interactions between spin-1 systems [68.8204255655161]
  We show how to harness multi-level emitters with several optical transitions to engineer photon-mediated interactions between effective spin-1 systems. Our results expand the quantum simulation toolbox available in cavity QED and quantum nanophotonic setups.
  arXiv  Detail & Related papers  (2022-06-03T14:52:34Z)
• Proposal for a cavity-induced measurement of the exchange coupling in quantum dots [0.0]
  In spin qubit arrays the exchange coupling can be harnessed to implement two-qubit gates and to realize intermediate-range qubit connectivity along a spin bus. We propose a scheme to characterize the exchange coupling between electrons in adjacent quantum dots.
  arXiv  Detail & Related papers  (2022-02-01T22:34:29Z)
• Strong electron-electron interactions in Si/SiGe quantum dots [0.0]
  We study two-electron wavefunctions in electrostatically confined quantum dots formed in a SiGe/Si/SiGe quantum well at zero magnetic field. Our calculations show that strong electron-electron interactions, induced by weak confinement, can significantly suppress the low-lying, singlet-triplet excitation energy. These results have important implications for the rational design and fabrication of quantum dot qubits with predictable properties.
  arXiv  Detail & Related papers  (2021-05-22T06:12:39Z)
• Spin-Dependent Transport Through a Colloidal Quantum Dot: The Role of Exchange Interactions [0.0]
  We combine atomistic electronic structure calculations with quantum master equation methods to study the transport of electrons and holes through strongly confined quantum dots. We find that a competition between the energy spacing between the two lowest quasiparticle energy levels determines the spin states of the lowest two quasiparticle energy levels. The low density of electron states results in a spin singlet being the lowest energy two-electron state whereas, in contrast, the high density of states and significant exchange interaction results in a spin triplet being the lowest energy two-hole state.
  arXiv  Detail & Related papers  (2021-02-15T19:00:00Z)
• Information Scrambling in Computationally Complex Quantum Circuits [56.22772134614514]
  We experimentally investigate the dynamics of quantum scrambling on a 53-qubit quantum processor. We show that while operator spreading is captured by an efficient classical model, operator entanglement requires exponentially scaled computational resources to simulate.
  arXiv  Detail & Related papers  (2021-01-21T22:18:49Z)
• Quantum chaos driven by long-range waveguide-mediated interactions [125.99533416395765]
  We study theoretically quantum states of a pair of photons interacting with a finite periodic array of two-level atoms in a waveguide. Our calculation reveals two-polariton eigenstates that have a highly irregular wave-function in real space.
  arXiv  Detail & Related papers  (2020-11-24T07:06:36Z)
• Conditional quantum operation of two exchange-coupled single-donor spin qubits in a MOS-compatible silicon device [48.7576911714538]
  Silicon nanoelectronic devices can host single-qubit quantum logic operations with fidelity better than 99.9%. For the spins of an electron bound to a single donor atom, introduced in the silicon by ion implantation, the quantum information can be stored for nearly 1 second. Here we demonstrate the conditional, coherent control of an electron spin qubit in an exchange-coupled pair of $31$P donors implanted in silicon.
  arXiv  Detail & Related papers  (2020-06-08T11:25:16Z)
• Radiation induced interaction potential of two qubits strongly coupled with a quantized electromagnetic field [0.0]
  We investigate the interaction of two two-level qubits with a single mode quantum field in a cavity without rotating wave approximation. It is shown that the observable characteristics are substantially dependent on the distance between the qubits in the strong coupling regime. This allows one to perform the quantum control of the qubits, which can be exploited for the recording and transmission of quantum information.
  arXiv  Detail & Related papers  (2020-05-31T14:04:30Z)
• Entanglement generation via power-of-SWAP operations between dynamic electron-spin qubits [62.997667081978825]
  Surface acoustic waves (SAWs) can create moving quantum dots in piezoelectric materials. We show how electron-spin qubits located on dynamic quantum dots can be entangled.
  arXiv  Detail & Related papers  (2020-01-15T19:00:01Z)

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.