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Quantum Paper Club

Engineering New Doppler Limits

When you want to trap neutral atoms in optical tweezers you better be cold. And when I say cold I don’t mean dilution fridge cold. I mean 10 times colder. To reach such temperatures we conventionally use laser cooling, which brings us to the doppler temperature proportional to the transition linewidth. But what if the…

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Quantum Paper Club

Entropy Spectroscopy of a Bilayer Graphene Quantum Dot

Bilayer graphene (BLG) has emerged as a promising platform for hosting qubits within 2D materials. By encapsulating it in a dielectric and applying gating techniques, one can electrostatically confine individual charge carriers, both electrons and holes, and thus obtain what is called a quantum dot (QD). Charge detection schemes allow us study the quantum properties…

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Quantum Paper Club

Soft information decoding: Are we overlooking measurement details in quantum error correction?

Quantum computers can provide asymptotically faster computation times than their classical counterparts in specific applications. However, to outperform the classical computers we have today, we need large-scale, fault-tolerant devices. Quantum error correction (QEC) is considered one of the most promising ways of achieving this milestone. However, much work is still needed to improve both the…

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Quantum Paper Club

Supersolidity in ultracold quantum gases: the simultaneous crystalline and superfluid nature of dipolar atoms

Quantum physics frequently gives rise to conceptual paradoxes that defy our classical intuition. In many-body quantum systems, interactions are key, especially when they dominate over kinetic energy. Their form and strength crucially define the existing strongly-correlated quantum phases of matter and dictate phenomena beyond the classical regime. Dipolar interactions, particularly relevant in strongly magnetic atoms,…

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Quantum Paper Club

Performance constraints of NISQ quantum algorithms and their mitigation with 3D-integrated superconducting quantum devices

In recent years, the excitement around NISQ algorithms has diminished, partly due to the performance limitations of existing quantum computers. Devices with more qubits and lower error rates are necessary to realize the potential of quantum computing. In the first half of this talk, I will illustrate these performance limitations with the example of the…

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Quantum Paper Club

Two-dimensional terahertz spectroscopy in complex matter systems

Two-dimensional terahertz spectroscopy (2DTS), a terahertz analogue of nuclear magnetic resonance, stands as a novel technique poised to address numerous open questions in complex condensed matter systems. The conventional theoretical framework, widely used for interpreting multidimensional spectra of discrete quantum-level systems, falls short in capturing the continua of collective excitations in strongly correlated materials, and…