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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Operating two exchange-only qubits in parallel.

Mateusz T Mądzik1, Florian Luthi2, Gian Giacomo Guerreschi2

  • 1Technology Research Group, Intel Corporation, Hillsboro, OR, USA. mateusz.madzik@intel.com.

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Researchers demonstrate parallel operations for two exchange-only qubits in semiconductor quantum dots. This advancement in quantum computing control maintains qubit quality and enables new gate operations, paving the way for larger quantum systems.

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Area of Science:

  • Quantum Computing
  • Semiconductor Physics

Background:

  • Semiconductors and quantum dots are leading platforms for building large-scale quantum computers.
  • Precise control of exchange interactions between electrons in quantum dots is crucial for qubit manipulation.
  • High-fidelity, concurrent quantum operations are essential to maximize qubit coherence.

Purpose of the Study:

  • To demonstrate parallel operation of two exchange-only qubits using six quantum dots.
  • To validate the effectiveness of parallel exchange pulse techniques for maintaining qubit control quality.
  • To showcase novel quantum gate operations and readout methods for semiconductor qubits.

Main Methods:

  • Utilized randomized benchmarking (RB) to assess qubit control during parallel operations.
  • Implemented parallel pulse sequences on five barrier gates to modulate exchange interactions.
  • Employed cross-entropy benchmarking (XEB) for performance characterization of the quantum system.

Main Results:

  • Maximal parallel operation of exchange interactions maintained qubit control quality compared to sequential methods.
  • Achieved the first experimental demonstrations of an iSWAP gate for exchange-only qubits.
  • Successfully implemented a charge-locking Pauli spin blockade (PSB) readout method.

Conclusions:

  • Parallel operation techniques are adaptable to various quantum-dot-based qubit encodings.
  • The demonstrated methods enhance the feasibility of scalable quantum computing using semiconductor platforms.
  • The study presents significant advancements in controlling and reading out semiconductor qubits.