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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Preparing Multipartite Entangled Spin Qubits via Pauli Spin Blockade.

Sinan Bugu1, Fatih Ozaydin2,3, Thierry Ferrus4

  • 1Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan. bugu.s.aa@m.titech.ac.jp.

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Researchers propose a new method using Pauli spin blockade in double quantum dots to create large-scale W states of electrons. This approach avoids photon assistance, simplifying quantum technology development.

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Area of Science:

  • Quantum Information Science
  • Solid-State Quantum Technologies
  • Quantum Computing

Background:

  • Generating large-scale multi-partite entangled states is crucial for quantum science and technologies.
  • Existing methods for creating entangled states often require complex setups, such as optical cavities.
  • Electron-based quantum systems offer a promising platform for scalable quantum information processing.

Purpose of the Study:

  • To propose a novel setup for preparing large-scale W states of electrons using Pauli spin blockade (PSB).
  • To demonstrate a method for fusing smaller W states into larger ones without photon assistance.
  • To advance solid-state quantum technologies by providing a simpler, more accessible entanglement generation scheme.

Main Methods:

  • Utilizing Pauli spin blockade (PSB) in a double quantum dot (DQD) system.
  • Implementing a scheme where two W states fuse by transferring single electrons between quantum dots.
  • Leveraging the presence or absence of PSB to determine successful state fusion.

Main Results:

  • Successfully demonstrated the fusion of two W states (n and m electrons) into a larger W state (n + m - 2 electrons).
  • The proposed method does not require photon assistance or optical cavities, simplifying experimental requirements.
  • Showcased methods to improve the success rate of the W state preparation.

Conclusions:

  • The proposed PSB-based scheme offers a viable and simplified approach for generating large-scale W states of electrons.
  • This method is compatible with current technology and well-established sensing techniques.
  • The scheme has direct implications for the advancement of solid-state quantum technologies and quantum computing.