Quantum Computation Protocol for Dressed Spins in a Global Field

Abstract

Spin qubits are contenders for scalable quantum computation because of their long coherence times demonstrated in a variety of materials, but individual control by frequency-selective addressing using pulsed spin resonance creates severe technical challenges for scaling up to many qubits. This individual resonance control strategy requires each spin to have a distinguishable frequency, imposing a maximum number of spins that can be individually driven before qubit crosstalk becomes unavoidable. Here we describe a complete strategy for controlling a large array of spins in quantum dots dressed by an on-resonance global field, namely a field that is constantly driving the spin qubits, to dynamically decouple from the effects of background magnetic field fluctuations. This approach -- previously implemented for the control of single electron spins bound to electrons in impurities -- is here harmonized with all other operations necessary for universal quantum computing with spins in quantum dots. We define the logical states as the dressed qubit states and discuss initialization and readout utilizing Pauli spin blockade, as well as single- and two-qubit control in the new basis. Finally, we critically analyze the limitations imposed by qubit variability and potential strategies to improve performance.

12 pages, 6 figures; added identifier to reference 44

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Cited by in corpus (23)

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• High Fidelity Control of a Nitrogen-Vacancy Spin Qubit at Room Temperature using the SMART Protocol
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• Two-qubit CZ gates robust against charge noise in silicon while compensating for crosstalk using neural network
• Violating Bell's inequality in gate-defined quantum dots
• Exploiting Anyonic Behavior of Quasicrystals for Topological Quantum Computing
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• Impact of electrostatic crosstalk on spin qubits in dense CMOS quantum dot arrays
• Improved Single-Shot Qubit Readout Using Twin RF-SET Charge Correlations
• Neural-network-designed three-qubit gates robust against charge noise and crosstalk in silicon
• Beyond-adiabatic Quantum Admittance of a Semiconductor Quantum Dot at High Frequencies: Rethinking Reflectometry as Polaron Dynamics
• A dressed singlet-triplet qubit in germanium
• Accessing the Full Capabilities of Filter Functions: A Tool for Detailed Noise and Control Susceptibility Analysis
• Concatenated continuous driving of silicon qubit by amplitude and phase modulation
• Enhanced local addressability of a spin array with local exchange pulses and global microwave driving