Simultaneous Operations in a Two-Dimensional Array of Singlet-Triplet Qubits
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Simultaneous Operations in a Two-Dimensional Array of Singlet-Triplet Qubits. / Fedele, Federico; Chatterjee, Anasua; Fallahi, Saeed; Gardner, Geoffrey C.; Manfra, Michael J.; Kuemmeth, Ferdinand.
In: PRX Quantum, Vol. 2, No. 4, 040306, 08.10.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Simultaneous Operations in a Two-Dimensional Array of Singlet-Triplet Qubits
AU - Fedele, Federico
AU - Chatterjee, Anasua
AU - Fallahi, Saeed
AU - Gardner, Geoffrey C.
AU - Manfra, Michael J.
AU - Kuemmeth, Ferdinand
PY - 2021/10/8
Y1 - 2021/10/8
N2 - In many physical approaches to quantum computation, error-correction schemes assume the ability to form two-dimensional qubit arrays with nearest-neighbor couplings and parallel operations at multiple qubit sites. While semiconductor spin qubits exhibit long coherence times relative to their operation speed and single-qubit fidelities above error correction thresholds, multiqubit operations in two-dimensional arrays have been limited by fabrication, operation, and readout challenges. We present a two-by-two array of four singlet-triplet qubits in gallium arsenide and show simultaneous coherent operations and four-qubit measurements via exchange oscillations and frequency-multiplexed single-shot measurements. A larger multielectron quantum dot is fabricated in the center of the array as a tunable interqubit link, which we utilize to demonstrate coherent spin exchange with selected qubits. Our techniques are extensible to other materials, indicating a path towards quantum processors with gate-controlled spin qubits.
AB - In many physical approaches to quantum computation, error-correction schemes assume the ability to form two-dimensional qubit arrays with nearest-neighbor couplings and parallel operations at multiple qubit sites. While semiconductor spin qubits exhibit long coherence times relative to their operation speed and single-qubit fidelities above error correction thresholds, multiqubit operations in two-dimensional arrays have been limited by fabrication, operation, and readout challenges. We present a two-by-two array of four singlet-triplet qubits in gallium arsenide and show simultaneous coherent operations and four-qubit measurements via exchange oscillations and frequency-multiplexed single-shot measurements. A larger multielectron quantum dot is fabricated in the center of the array as a tunable interqubit link, which we utilize to demonstrate coherent spin exchange with selected qubits. Our techniques are extensible to other materials, indicating a path towards quantum processors with gate-controlled spin qubits.
KW - QUANTUM
KW - GATE
U2 - 10.1103/PRXQuantum.2.040306
DO - 10.1103/PRXQuantum.2.040306
M3 - Journal article
VL - 2
JO - PRX Quantum
JF - PRX Quantum
SN - 2691-3399
IS - 4
M1 - 040306
ER -
ID: 282529745