MIT Quantum Photonics Laboratory’s Post

#Light_matter interaction reveals new paradigm of #quantum #information_technology I came across an interesting work by Prof. Noejung Park from UNIST's Department of Physics and his team. I will try to share the salient points with you. A novel quantum state and a pioneering mechanism for extracting and controlling quantum information using exciton and #Floquet_states. For the first time, demonstrated the formation and synthesis process of exciton and Floquet states, which arise from light-matter interactions in two-dimensional semiconductors. Captures quantum information in real-time as it unfolds through #entanglement, offering valuable insights into the exciton formation process in these materials, thereby advancing quantum information technology. Unlike traditional three-dimensional solids, where quantum coherence is challenging to maintain owing to thermal influences, two-dimensional semiconductors feature energy levels for excitons and conduction bands that remain distinct owing to weaker screening effects, thus preserving coherence over extended periods. This distinction makes two-dimensional semiconductors promising for developing quantum information devices. Yet, until now, the coherence and decoherence mechanisms of electrons during exciton formation have been poorly understood. Through theoretical calculations using time-resolved angular-resolved photoelectron spectroscopy on two-dimensional semiconductor materials, confirm, that exciton formation coincides with the creation of a Floquet state, producing a combined new quantum state. Additionally, they identified the mechanism by which quantum entanglement occurs within this state and proposed a real-time method to extract, unfold, and control quantum information. A new quantum state, known as the exciton-Floquet synthesis state, and proposed a novel mechanism for quantum entanglement and quantum information extraction. This is anticipated to drive forward quantum information technology research in two-dimensional semiconductors. More information: Hyosub Park et al, Novel Quantum States of Exciton–Floquet Composites: Electron–Hole Entanglement and Information, Nano Letters (2024). DOI: 10.1021/acs.nanolett.4c03100

Watch now our latest webinar focused on the 𝗘𝗻𝗮𝗯𝗹𝗶𝗻𝗴 𝗕𝗿𝗲𝗮𝗸𝘁𝗵𝗿𝗼𝘂𝗴𝗵𝘀 𝗶𝗻 𝗤𝘂𝗮𝗻𝘁𝘂𝗺 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝘆 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 in collaboration with Quantum Machines. The experts: Dr Harriet van der Vliet, Dr Nicholas Chittock and the Quantum Machines' presenter - Dr Michaela Eichinger, PhD share the latest advancements in: 👉 the application of atomic layer deposition (ALD) and atomic layer etching (ALE) to materials relevant for quantum applications, 👉 processing techniques that are inherently low damage may enable the fabrication of quantum devices with lower losses, helping to provide longer coherence times and quantum devices with higher Q-factors, 👉 our recent cryogenic platform for quantum computing and quantum technology research, 👉 the ProteoxS platform - a perfect dilution refrigerator not only for small numbers of qubits and fundamental research but also used as a tool for educating the quantum workforce, 👉 transforming Quantum Computing and Research with Next-Gen Control. To learn more and watch on demand click the link below: https://okt.to/UPSQRx #plasmatechnology #quantum #quantumtechnology #ALD #ALE Grant Baldwin

For over six decades, the development of single-photon detectors has been based on photoexcitation across energy gaps in semiconductors or superconductors. While effective for high-energy photons, this approach limits detection capabilities at lower energies. In a new work now on arXiv, Bevin Huang, Ethan Arnault et. al. in colaboration with Raytheon Technologies (BBN), Washington University in St. Louis and Pohang University of Science and Technology introduce a fundamentally different strategy: an electron calorimeter that directly measures the internal energy of a single photon—a concept so challenging it was long considered experimentally infeasible. By leveraging the remarkable thermal properties of pseudo-relativistic electrons in graphene, our proof-of-concept experiment demonstrates a strong calorimetric response to single near-infrared photons that is readily expandable to mid- and far-infrared regimes. Using a hybrid Josephson junction, the gate-tunable electron density, and a novel optical scanner in our cryogenic setup, we achieve single-photon detection with an intrinsic quantum efficiency of 87% at operating temperatures up to 1.2 K. Read more here: https://lnkd.in/g2hDkuA3 Thank you Oak Ridge Institute for Science and Education, U.S. Army DEVCOM Army Research Laboratory, National Research Foundation of Korea and Research Laboratory of Electronics at MIT! #QuantumTech #SinglePhotonDetection #Graphene #Photonics #Cryogenics #QuantumEfficiency #Innovation #QuantumResearch #AdvancedMaterials #PhotonDetectors #arXiv

I am delighted to share our latest scientific publication titled "Observation of an abrupt 3D-2D morphological transition in thin Al layers grown by MBE on an InGaAs surface." This study explores in situ aluminum (Al) growth on InGaAs/InAs using molecular beam epitaxy (MBE). Our key findings reveal how variations in Al growth rate and substrate temperature influence the nucleation and growth dynamics of Al layers. It was observed that increasing the Al flux rates leads to a transition from isolated 3D islands to a uniform 2D layer, resulting in high-quality, continuous thin Al layers grown at near-room temperatures, eliminating the need for complex cryogenic cooling. Isolated 3D Al islands were observed when using a low growth rate of aluminum, but 2D continuous Al layers were observed once the growth rate exceeds 1.5 Å/s. In-plane magnetic field measurements were also reported, showing the superconductivity transitions for thin Al layers. Here is the link to read the full paper: https://lnkd.in/gmVpJu_n I would like to acknowledge the significant efforts of the co-authors in this study. This project is funded by Transformative Quantum Technologies. We greatly appreciate their ongoing support, which enables us to continue pushing the boundaries in the field of topological quantum computing. #QuantumComputing #MolecularBeamEpitaxy #Semiconductor #Superconductor #SEM #AFM #JVSTA #UWaterloo #TopologicalQubits Journal of Vacuum Science

Refer to the rabbit candy post.

A recent study in Nature Communications presents a novel algorithm and an integrated quantum photonic microprocessor chip for generating molecular vibronic spectra. This innovative approach uses squeezed vacuum states and a linear optical network, making experimental implementation more feasible. The research successfully simulated the vibronic spectra of several molecules with high fidelity, demonstrating the potential for tackling complex quantum chemistry problems beyond classical computational capabilities. https://lnkd.in/gZiNCbpS #QuantumPhotonics #PhotonicIntegratedCircuits #Research Citation: Figure 1 from Zhu, H.H., Sen Chen, H., Chen, T. et al. Large-scale photonic network with squeezed vacuum states for molecular vibronic spectroscopy. Nat Commun 15, 6057 (2024). https://lnkd.in/gWdtN-Rh

🌌 Exploring Quantum Transport at Cryogenic Temperatures with QTCAD 🌡️❄️ QTCAD is your go-to tool for modeling and simulating quantum transport in nanoscale devices, optimized for operating in ultra-low temperature environments—think cryogenic conditions as cold as 100 millikelvin or below! 🔍 What Can You Explore with QTCAD? QTCAD empowers research and development in: 🧪 Quantum Dots ⚡ Single-Electron Transistors 🎛️ Spin Qubits 🔬 Other Nanoscale Systems for quantum computing and advanced research 💡 Why Cryogenic Temperatures Matter Devices at this scale need extreme cold to minimize thermal noise and preserve quantum coherence. QTCAD helps you dive deep into the physics at play—quantum tunneling, Coulomb blockade, electron-phonon interactions, and more. 🚀 Whether you’re optimizing spin qubit operations or analyzing transport in single-electron devices, QTCAD provides the computational insights you need to succeed in the quantum realm. 📩 Ready to harness QTCAD for your next cryogenic project? Let’s collaborate! #QuantumComputing #CryogenicPhysics #QTCAD #NanoscaleDevices #QuantumTransport

The excited state of a two-level system will eventually decay to the ground state due to coupling with the electromagnetic field, causing it to lose its status as an eigenstate. However, creating long-lived or even immortalized excited states would be highly beneficial for developing quantum sensors and novel mixed phases of light and matter. In a new article in Nature Communications, together with a team of physicists from Trinity College Dublin, IPHT in Jena, and the University of Würzburg we propose that coherent perfect absorption could be used to maintain a polaritonic state indefinitely. This polaritonic state consists of a strongly coupled plasmonic nanocavity and a single quantum emitter. Our publication demonstrates that the constant delivery of energy through a plasmonic waveguide, under the condition of coherent perfect absorption, should achieve this. https://lnkd.in/exm9g--Y

Researchers from New York University and Charles University in Prague, Czech Republic, have observed growth-induced self-organized stacking domains when three #graphene layers are stacked and twisted with precision. The findings demonstrate how specific stacking arrangements in three-layer graphene systems emerge naturally – eliminating the need for complex, non-scalable techniques traditionally used in graphene twisting fabrication. The size and shape of these stacking domains are influenced by the interplay of strain and the geometry of the three-layer graphene regions. Some domains form as stripe-like structures, tens of #nanometers wide and extending over microns. https://lnkd.in/gBrmF93p (Work funded by the U.S. Department of Energy (DOE) and the United States Department of Defense) Elisa Riedo Martin Rejhon

Superconductivity, the ability of certain materials to conduct electricity with zero resistance, holds profound potential for advancements of quantum technologies. #quantumphysicstechnology #greenchemistry #aromaticgraphene #superconductivity #inclusivenanoreactor