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2018 ; 4
(7
): eaar3960
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A crossbar network for silicon quantum dot qubits
#MMPMID29984303
Li R
; Petit L
; Franke DP
; Dehollain JP
; Helsen J
; Steudtner M
; Thomas NK
; Yoscovits ZR
; Singh KJ
; Wehner S
; Vandersypen LMK
; Clarke JS
; Veldhorst M
Sci Adv
2018[Jul]; 4
(7
): eaar3960
PMID29984303
show ga
The spin states of single electrons in gate-defined quantum dots satisfy crucial
requirements for a practical quantum computer. These include extremely long
coherence times, high-fidelity quantum operation, and the ability to shuttle
electrons as a mechanism for on-chip flying qubits. To increase the number of
qubits to the thousands or millions of qubits needed for practical quantum
information, we present an architecture based on shared control and a scalable
number of lines. Crucially, the control lines define the qubit grid, such that no
local components are required. Our design enables qubit coupling beyond nearest
neighbors, providing prospects for nonplanar quantum error correction protocols.
Fabrication is based on a three-layer design to define qubit and tunnel barrier
gates. We show that a double stripline on top of the structure can drive
high-fidelity single-qubit rotations. Self-aligned inhomogeneous magnetic fields
induced by direct currents through superconducting gates enable qubit
addressability and readout. Qubit coupling is based on the exchange interaction,
and we show that parallel two-qubit gates can be performed at the detuning-noise
insensitive point. While the architecture requires a high level of uniformity in
the materials and critical dimensions to enable shared control, it stands out for
its simplicity and provides prospects for large-scale quantum computation in the
near future.
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