Systems, methods, and devices for noise-insensitive qubit gate operations
AssigneesUniversity of Maryland, College Park, The United States of America as represented by the Director, National Security Agency
InventorsYun-Pil SHIM, Charles George TAHAN
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Abstract
An always-on, exchange-only (AEON) qubit is comprised of three two-level systems (e.g., semiconductor quantum dot or other spin encoded qubit) and can be operated at a “sweet spot” during both single qubit and two-qubit gate operations. The “sweet spot” operation is immune to variations in noise with respect to nontrivial detuning parameters defining the AEON. By operating at the “sweet spot,” both single and two-qubit gate operations can be performed using only exchange pulses (e.g., DC voltage pulses applied to tunneling gates).
Claims25
A method comprising:
- performing a single qubit gate operation on a three-spin qubit or a two-qubit gate operation on adjacent three-spin qubits,
- wherein each qubit has first through third two-level systems having respective local potentials ε1 through ε3,
- wherein each qubit is characterized by a pair of non-trivial detuning parameters representing energy differences between respective energy levels of the two-level systems of the qubit,
- wherein in performing the single qubit gate operation or the two-qubit gate operation:
- local potentials of the two-level systems of each qubit are controlled such that derivatives of a respective frequency of the qubit with respect to each detuning parameter are within 10−3 of zero, and
- tunnel couplings between adjacent two-level systems of each qubit are controlled to be non-zero.
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A system comprising:
- a three-spin qubit with first through third two-level systems having respective local potentials ε1 through ε3;
- and
- a controller comprising circuitry programmed to control the qubit in performing a single qubit gate operation or a two-qubit gate operation,
- wherein the qubit is characterized by a pair of non-trivial detuning parameters representing energy differences between respective energy levels of the two-level systems of the qubit, and
- wherein, in performing the single qubit gate operation or the two-qubit gate operation, the circuitry of the controller is programmed to control:
- local potentials of the two-level systems of the qubit such that derivatives of a respective frequency of the qubit with respect to each detuning parameter are within 10−3 of zero, and
- tunnel couplings between adjacent two-level systems of each qubit to be non-zero.
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Dependencies are inferred from the claim text.