2014
DOI: 10.1063/1.4875909
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Full control of quadruple quantum dot circuit charge states in the single electron regime

Abstract: We report the realization of an array of four tunnel coupled quantum dots in the single electron regime, which is the first required step toward a scalable solid state spin qubit architecture. We achieve an efficient tunability of the system but also find out that the conditions to realize spin blockade readout are not as straightforwardly obtained as for double and triple quantum dot circuits. We use a simple capacitive model of the series quadruple quantum dots circuit to investigate its complex charge state… Show more

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Cited by 41 publications
(38 citation statements)
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“…The main idea is to use cotunneling for both the entangling and state manipulation during the transfer to the detectors. Recent experimental demonstrations of highly controllable multiple quantum dots systems [50][51][52] together with existing short-time charge detection techniques [44][45][46] Here we derive the effective cotunneling Hamiltonian in Eq. (2) in the main text.…”
Section: Figmentioning
confidence: 99%
“…The main idea is to use cotunneling for both the entangling and state manipulation during the transfer to the detectors. Recent experimental demonstrations of highly controllable multiple quantum dots systems [50][51][52] together with existing short-time charge detection techniques [44][45][46] Here we derive the effective cotunneling Hamiltonian in Eq. (2) in the main text.…”
Section: Figmentioning
confidence: 99%
“…Experiments with multiple coupled qubits have demonstrated proof-of-principle computations and preliminary steps towards a logical qubit. The field of quantum-processing technology includes photons [17,22], trapped ions [14,15,23], superconducting qubits [18,19,25,[28][29][30], and spins in diamond [24,26], gallium arsenide [20,[32][33][34][35][36][37][38], and silicon [27,[39][40][41][42][43][44][45][46][47]. However, there are unique advantages to a silicon quantum processor, and the potential for high-fidelity control of longlived spin qubits motivates this proposal.…”
Section: Introductionmentioning
confidence: 99%
“…show a striking controllability of inter-dot tunnel couplings 11,12 but multiple tunnel-coupled QDs have been realized mostly in a 1D arrangement [13][14][15] . Two-dimensional arrangement of QDs was initially demonstrated using dry etching 16 and local anodic oxidation 17,18 , but the inter-dot tunnel coupling is hard to vary in these devices since it is mainly determined by the device geometry and indeed exhibits no electrical tunability.…”
Section: Introductionmentioning
confidence: 99%