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Articles by Danny Wan
Precision high-speed quantum logic with holes on a natural silicon foundry platform
Abstract Silicon spin qubits in gate-defined quantum dots leverage established semiconductor infrastructure and offer a scalable path toward transformative quantum technologies. Holes spins in silicon offer compact all-electrical control, whilst retaining the salient features of a quantum dot qubit architecture. However, silicon hole spin qubits are not as advanced as electrons, due to increased susceptibility to disorder and more complex spin physics.
Eight-qubit operation of a 300 mm SiMOS foundry-fabricated device
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Abstract Silicon spin qubits are a promising platform for quantum computing due to their high coherence, controllability, and CMOS manufacturability, yet scalable implementations have so far been limited to a few qubits. Here, to take a step towards larger qubit systems, we tune and coherently control an eight-dot linear array of silicon spin qubits fabricated in a 300 mm CMOS-compatible foundry process, establishing operational scalability beyond the two-qubit regime.
By Andreas Nickl, Nard Dumoulin Stuyck, Paul Steinacker, Jesus D. Cifuentes, Santiago Serrano, Mengke Feng, Ensar Vahapoglu, Fay E. Hudson, Kok Wai Chan, Stefan Kubicek, Julien Jussot, Yann Canvel, Sofie Beyne, Roger Loo, Clément Godfrin, Bart Raes, Danny Wan, Arne Laucht, Chih-Hwan Yang, André Pinto Saraiva, Christopher C. Escott, Kristiaan De Greve, Andrew Dzurak, Tuomo Tanttu, Yosuke Shimura, Sylvain Baudot
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Nature
Verified
A lineage-specific heat-induced feedback loop controls HrcA to promote chlamydial fitness under stress
Abstract Bacterial stress responses rely on transcriptional regulation by sigma factors and repressors. In Chlamydia, which lacks a dedicated heat shock sigma factor, repressor HrcA limits chaperone gene expression under non-stressed conditions. While HrcA function may be enhanced by the chaperone GroESL in a positive feedback loop, here we identify a heat-induced negative feedback loop mediated by HagF, a protein unique to Chlamydiota and conserved across Chlamydia species.
Chlamydia plasmid-encoded protein Pgp2 is a replication initiator with a unique beta-hairpin necessary for iteron-binding and plasmid replication
Abstract The virulence plasmid of the obligate intracellular bacterium Chlamydia encodes eight proteins. Among these, Pgp3 is crucial for pathogenicity, and Pgp4 functions as a transcriptional regulator of both plasmid and chromosomal genes. The remaining proteins, Pgp1, Pgp5, Pgp6, Pgp7, and Pgp8, are predicted to play various roles in plasmid replication or maintenance based on their amino acid sequences.
Analyzing RNA-Seq Data from Chlamydia with Super Broad Transcriptomic Activation: Challenges, Solutions, and Implications for Other Systems
Abstract Motivation: RNA sequencing (RNA-Seq) offers profound insights into the complex transcriptomes of diverse biological systems. However, standard differential expression analysis pipelines based on DESeq2 and edgeR encounter challenges when applied to the immediate early transcriptomes of Chlamydia spp., obligate intracellular bacteria.
How Oakland airport name change will boost the Bay Area’s economy
Say someone wanted to come to the Bay Area to spend a weekend in Wine Country, meet with colleagues at one of the three national laboratories in the East Bay, or even just visit family or friends. Many of these visitors, who may be unfamiliar with our local geography, would automatically assume the closest airport is San Francisco International Airport. But they’d be wrong. In all these instances and many others, the Metropolitan Oakland International Airport is closer.
Modeling semiconductor spin qubits and their charge noise environment for quantum gate fidelity estimation
Abstract The spin of an electron confined in semiconductor quantum dots is currently a promising candidate for quantum bit (qubit) implementations. Taking advantage of the existing CMOS integration technologies, such devices can offer a platform for large scale quantum computation. However, a quantum mechanical framework bridging a device's physical design and operational parameters to the qubit's energy space is lacking.
Opinion: Oakland A’s plans won’t hinder port’s future expansion Original
Cargo vessels haven’t docked at the Port of Oakland’s Howard Terminal since 2013. It’s too small to handle the 1,200-foot-long container ships that now dominate the shipping industry. Its waters aren’t even deep enough to accommodate these mega-ships. The Oakland seaport is growing. With the addition of Oakland Army Base land in 2006, the port has significant room. The port moves the equivalent of 2.4 million 20-foot cargo containers annually, and we are continuing to add capacity.
California Voice: State Legislature can help fix America’s broken supply chain
The global supply chain crisis is daunting. Congestion and bottlenecks across the West Coast have left large cargo vessels stranded at anchor for weeks on end. Across the country, our supply chain has faced major disruptions, driving up costs for consumers and inevitably causing major delays on delivery of essential goods. Earlier this month, I testified before the Senate and Assembly Select Committees on Ports and Goods Movement to offer policymakers solutions to address these challenges.
Opinion: How California can help fix America’s broken supply chain
The global supply chain crisis is daunting. Congestion and bottlenecks across the West Coast have left large cargo vessels stranded at anchor for weeks on end. Across the country, our supply chain has faced major disruptions, driving up costs for consumers and inevitably causing major delays on delivery of essential goods. Last week, I testified before the Senate & Assembly Select Committees on Ports and Goods Movement to offer policymakers solutions to address these challenges.
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