LZSM spectroscopy extracts a charge noise spectral density of 0.5-0.9 neV/√Hz in bilayer graphene quantum dots, with temperature and frequency dependence indicating dominance of thermal Johnson noise or electron-phonon coupling over two-level fluctuators.
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Mobile spin qubits in silicon can leapfrog over occupied dots by exploiting low valley splitting, enabling new connectivity routes and SWAP^γ entangling gates.
SAGE qubits gain magnetic protection from singlet-only encoding and always-on exchange but need refocusing pulses and ramp control to maintain coherence and gate performance against charge noise.
citing papers explorer
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Probing charge noise in bilayer graphene quantum dots by Landau-Zener-St\"uckelberg-Majorana spectroscopy
LZSM spectroscopy extracts a charge noise spectral density of 0.5-0.9 neV/√Hz in bilayer graphene quantum dots, with temperature and frequency dependence indicating dominance of thermal Johnson noise or electron-phonon coupling over two-level fluctuators.
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Spin Qubit Leapfrogging: Dynamics of shuttling electrons on top of another
Mobile spin qubits in silicon can leapfrog over occupied dots by exploiting low valley splitting, enabling new connectivity routes and SWAP^γ entangling gates.
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Singlet-only always-on gapless exchange (SAGE) spin qubits: Charge noise effects and two-qubit gates
SAGE qubits gain magnetic protection from singlet-only encoding and always-on exchange but need refocusing pulses and ramp control to maintain coherence and gate performance against charge noise.