QuantumBW Colloquium

Molecules and molecule-based systems show great promise as a novel platform for the development of spin-based quantum technologies. Their extensive tunability allows them to be adapted to specific use cases. Their atomically precise positionability with deterministic interactions may enable developing functional quantum assemblies of millions of qubits. Finally, their nanoscopic size guarantees excellent integrability in photonic and electronic devices. Long coherence times, two-qubit gate operations, electrical and optical readout ad single entity addressing have all been achieved. This talk will outline the state of the art in the field and highlight our contributions to it. Specifically, we will discuss how to prolong coherence times, how to create surface assemblies of molecular qubits, and how to use molecules as quantum memories.

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Large-scale quantum computers hold the promise to efficiently solve some computationally hard problems, for which efficient solutions are intractable on classical computers. To date, the construction of scalable fault-tolerant quantum computers remains a fundamental scientific and technological challenge. In this talk, we will first introduce basic concepts of quantum computing and quantum error correction, which allows one to protect quantum information during storage and processing, by redundant encoding of quantum information in logical qubits formed of multiple physical qubits. We will then discuss recent progress in the area of quantum topological quantum error correction, based on new theory concepts and collaborative experimental breakthroughs in state-of-the-art physical quantum processors, including trapped ions, Rydberg atoms and superconducting qubits. These results mark exciting first steps into the era of early fault-tolerant quantum computing with logical qubits.

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Superconducting quantum bits, or qubits, are at the forefront of quantum computing research. Harnessing the low loss properties of superconductors and the nonlinearity of Josephson junctions, qubits can be engineered to exist in quantum superposition states and they can be entangled, promising a new paradigm in information processing. By controlling and measuring these fragile quantum states, the community eventually aims to implement powerful quantum algorithms, which on some applications have a much more favorable scaling compared to classical counterparts. However, many challenges persist in maintaining coherence, mitigating noise, and enhancing gate fidelity. I will discuss three mesoscopic physics phenomena which significantly complicate the task of engineering coherent superconducting hardware: ionizing radiation interactions with the microelectronic qubit device substrate, long lived and uncontrolled two-level systems which imprint a memory in the qubit's environment, and fluctuations in the transparency of aluminum oxide tunnel barriers which are at the heart of Josephson junctions.

Live Stream

Live Stream

We will describe digital, analog, and digital-analog quantum computing paradigms. Furthermore, we will discuss the possibility of reaching quantum advantage for industry use cases with current quantum computers in trapped ions, superconducting circuits, neutral atoms, and photonic systems.

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