Always-on Exchange-ONly (AEON) spin-based qubits

July 20th, 2016  |  Published in Featured, Quantum Computing, Research

We introduce an always-on, exchange-only qubit made up of three localized semiconductor spins that offers a true “sweet spot” to fluctuations of the quantum dot energy levels. Both single- and two-qubit gate operations can be performed using only exchange pulses while maintaining this sweet spot. We show how to interconvert this qubit to other three-spin encoded qubits as a new resource for quantum computation and communication.

Charge-noise-insensitive gate operations for always-on, exchange-only qubits РarXiv.org, Phys. Rev. B 93, 121410(R) (2016)

Talks: coming soon

Notable benefits include:

  • Full sweet spot to both detuning parameters that affect dot energy levels offering immunity to charge noise.
  • Ability to maintain this double sweet spot while tunnel gates change, allowing for all-DC, exchange-based control for charge-noise-insensitive (to first order) single and two qubit gates.
  • A two-encoded qubit entangling gate with a single exchange pulse (versus approximately 18 pulses for a traditional exchange only qubit).
  • Ability to smoothly convert the qubit to a 3-spin decoherence free subspace (3-DFS) qubit or an RX qubit while maintaining¬†the encoded quantum information, again while staying on the full sweet spot.
  • Zero dipole moment.
Top: 2 encoded AEON in qubits in 6 physical spin qubits (such as a single electron in a quantum dot). Bottom: sweet spots for both detuning parameters affecting the dot energy levels offering flat response to small changes in the gate potentials

Top: 2 encoded AEON in qubits in 6 physical spin qubits (such as a single electron in a quantum dot). Bottom: sweet spots for both detuning parameters affecting the dot energy levels offering flat response to small changes in the gate potentials

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