Radio frequency(RF)reflectometry is an effective and sensitive technique for detecting charge signal in semiconductor quantum dots,and its measurement bandwidth can reach the MHz ***,in accumulation mode devices,the p...
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Radio frequency(RF)reflectometry is an effective and sensitive technique for detecting charge signal in semiconductor quantum dots,and its measurement bandwidth can reach the MHz ***,in accumulation mode devices,the presence of parasitic capacitance makes RF reflectometry more *** universal approach is relocating the ion implantation region approximately 10μm from the center of the single-electron transistor(SET)and optimizing the design of the accumulation ***,this method puts forward more stringent requirements for micro-nano fabrication ***,we propose a split-gate structure that enables RF reflectometry when the ion-implanted region and the ohmic contact are farther from the SET *** Si-MOS devices,we employ a split-gate structure to achieve RF detection,with the ion-implanted region located 150μm away from the center of the *** an integration time of 140 nanoseconds,we achieved a readout fidelity exceeding 99.8%and a detection bandwidth of over 2 *** is an alternative solution for micro-nano fabrication processing that cannot achieve ion implantation areas closer to the center of the chip,and is applicable to various silicon-based semiconductor systems.
Valley, the intrinsic feature of silicon, is an inescapable subject in silicon-based quantum computing. At the spin–valley hotspot, both Rabi frequency and state relaxation rate are significantly enhanced. With prote...
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Valley, the intrinsic feature of silicon, is an inescapable subject in silicon-based quantum computing. At the spin–valley hotspot, both Rabi frequency and state relaxation rate are significantly enhanced. With protection against charge noise, the valley degree of freedom is also conceived to encode a qubit to realize noise-resistant quantum ***, based on the spin qubit composed of one or three electrons, we characterize the intrinsic properties of valley in an isotopically enriched siliconquantum dot(QD) device. For one-electron qubit, we measure two electric-dipole spin resonance(EDSR) signals which are attributed to partial occupation of two valley states. The resonance frequencies of two EDSR signals have opposite electric field dependences. Moreover, we characterize the electric field dependence of the upper valley state based on three-electron qubit experiments. The difference of electric field dependences of the two valleys is 52.02 MHz/V, which is beneficial for tuning qubit frequency to meet different experimental requirements. As an extension of electrical control spin qubits, the opposite electric field dependence is crucial for qubit addressability,individual single-qubit control and two-qubit gate approaches in scalable quantumcomputing.
Advances in quantum devices have brought scalable quantum computation closer to reality. We focus on the system-level issues of how quantum devices can be brought together to form a scalable architecture. In particula...
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Advances in quantum devices have brought scalable quantum computation closer to reality. We focus on the system-level issues of how quantum devices can be brought together to form a scalable architecture. In particular, vie examine promising silicon-based proposals. We discover that communication of quantum data is a critical resource in such proposals. We find that traditional techniques using quantum SWAP gates are exponentially expensive as distances increase and propose quantum teleportation as a means to communicate data over longer distances on a chip. Furthermore, we find that realistic quantum error-correction circuits use a recursive structure that benefits from using teleportation for long-distance communication. We identify a set of important architectural building blocks necessary for constructing scalable communication and computation. Finally, we explore an actual layout scheme for recursive error correction, and demonstrate the exponential growth in communication costs with levels of recursion, and that teleportation limits those costs.
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