Flux Pumped Kerr-Free Parametric Amplifier

Posted by klaurent Berkeley, This Week: Nanoscience

Kavli Affiliate: Irfan Siddiqi | Summary:We propose a flux-pumped superconducting parametric amplifier based on symmetrically threaded superconducting quantum interference devices (SQUIDs) that achieves a Kerr-free operating point under suitable drive conditions. Eliminating the Kerr nonlinearity is advantageous for quantum-limited amplification, as it mitigates unwanted distortions in squeezing and prevents degradation of both gain and quantum […]


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Consistent inclusion of triple substitutions within a coupled cluster based static quantum embedding theory

Posted by klaurent Berkeley, This Week: Nanoscience

Kavli Affiliate: Birgitta Whaley | Summary:We incorporate a solver for the fragment problem with accuracy beyond coupled cluster singles and doubles (CCSD) into the previously proposed static embedding framework, MPCC. To this end, we employ a CCSDT solver for the fragment subsystem. For the environment subsystem, we construct a perturbative estimate of the triples amplitudes, […]


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Field-driven Ion Pairing Dynamics in Concentrated Electrolytes

Posted by klaurent Berkeley, This Week: Nanoscience

Kavli Affiliate: David T. Limmer | Summary:We investigate ion pairing dynamics in electrolytes driven far from equilibrium using molecular simulations and nonequilibrium rate theory. Focusing on 0.5 M $mathrmLiPF_6$ in water and acetonitrile under uniform electric fields, we compute transition path theory observables including reactive fluxes and mean first-passage times of ion pairing. Moreover, we […]


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The impact of spurious imaginary phonon modes on thermal properties of Metal-organic Frameworks

Posted by klaurent Berkeley

Kavli Affiliate: Kristin Persson | Summary:Metal-organic Frameworks (MOFs) have emerged as potential candidates for direct air capture (DAC) of green house gases and water. Thermal properties of MOFs, such as their heat capacity, are used to determine the energy penalty associated with the adsorbent retrieval during the Temperature Swing Adsorption process. To aid exploration of […]


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Revealing Short- and Long-range Li-ion diffusion in Li$_2$MnO$_3$ from finite-temperature dynamical mean field theory

Posted by klaurent Berkeley

Kavli Affiliate: Kristin Persson | Summary:Li$_2$MnO$_3$ remains a crucial component of the Li-excess layered cathode family, $(1-x),mathrmLiMO_2 + x,mathrmLi_2MnO_3$ ($M$ = Mn, Ni, Co, dots), but its role in limiting Li-ion mobility remains under debate. Here we combine DFT+$U$, finite-temperature DMFT with a continuous-time quantum Monte Carlo impurity solver, and nudged-elastic-band (NEB) calculations to investigate […]


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A Surface-Scaffolded Molecular Qubit

Posted by klaurent Berkeley

Kavli Affiliate: Paul Alivisatos | Summary:Fluorescent spin qubits are central building blocks of quantum technologies. Placing these qubits at surfaces maximizes coupling to nearby spins and fields, enabling nanoscale sensing and facilitating integration with photonic and superconducting devices. However, reducing the dimensions or size of established qubit systems without sacrificing the qubit performance or degrading […]


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diffpy.morph: Python tools for model independent comparisons between sets of 1D functions

Posted by klaurent Berkeley

Kavli Affiliate: Naomi Ginsberg | Summary:diffpy$.$morph addresses a need to gain scientific insights from 1D scientific spectra in model independent ways. A powerful approach for this is to take differences between pairs of spectra and look for meaningful changes that might indicate underlying chemical, structural, or other modifications. The challenge is that the difference curve […]


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Observation of an exciton crystal in a moiré excitonic insulator

Posted by klaurent Berkeley

Kavli Affiliate: Michael Crommie | Summary:Strong Coulomb interactions can drive electrons to crystallize into a Wigner lattice. Achieving the bosonic analogue – a crystal of excitons – has remained elusive due to their short lifetimes and weaker interactions. Here, we report the observation of a thermodynamically stable exciton crystal in an excitonic insulator coupled to […]


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Frequency- and time-resolved second order quantum coherence function of IDTBT single-molecule fluorescence

Posted by klaurent Berkeley

Kavli Affiliate: Graham Fleming | Summary:The frequency- and time-resolved second order quantum coherence function (g(2)(τ)) of single-molecule fluorescence has recently been proposed as a powerful new quantum light spectroscopy that can reveal intrinsic quantum coherence in excitation energy transfer in molecular systems ranging from simple dimers to photosynthetic complexes. Yet, no experiments have been reported […]


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Collective Rabi-driven vibrational activation in molecular polaritons

Posted by klaurent Berkeley

Kavli Affiliate: Carlos Bustamante | Summary:Hybrid light-matter states, known as molecular polaritons, arise from electronic or vibrational strong coupling (ESC and VSC) with confined electromagnetic fields. While these have been widely studied, the influence of electron-nuclear dynamics in driven cavities remains largely unknown. Here, we report a previously unrecognized mechanism of vibrational activation that emerges […]


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