The discovery of matter wave polaron provides a new perspective for photon quantum technology

2022-07-11 0 By

Experimental schematic diagram and polaron formation.Image credit: Nature Physics (2022).DOI: 10.1038/ S41567-022-01565-4 The development of experimental platforms to advance the field of quantum science and technology (QIST) brings with it a unique set of advantages and challenges common to any emerging technology.Stony Brook University researchers led by Dr. Dominik Schneble report the formation of matter-wave polarons in optical lattices, an experimental discovery that can be studied with the Central QIST paradigm by using direct quantum simulations of ultracold atoms.The researchers expect their new quicparticle, which mimics photons that interact strongly in materials and devices but circumvents some of the inherent challenges, will benefit the further development of QIST platforms that promise to transform computing and communications technology.The findings are detailed in a paper published in the journal Nature Physics.This study reveals fundamental polaron properties and associated many-body phenomena, and opens up new possibilities for the study of polaron quantum matter.An important challenge with using a photon-based QIST platform is that while photons can be an ideal carrier for quantum information, they do not usually interact with each other.The lack of such interactions also inhibits the controlled exchange of quantum information between them.Scientists have figured out a way around this problem by coupling photons to heavier excitations in the material to form polarons, chimeric hybrids between light and matter.Collisions between these heavier quasiparticles allow photons to interact efficiently.This enables photon-based quantum gate operations and ultimately the entire QIST infrastructure.However, a major challenge is the limited lifetime of these photon-based polarons due to their radiative coupling with the environment, resulting in uncontrolled spontaneous decay and decoherence.An artistic rendering of the results of the polaron study shows atoms in an optical lattice forming an insulating phase (left);Atoms become matter wave polarons through vacuum coupling, mediated by microwave radiation shown in green (center);Polarons become mobile and form superfluid phases to achieve strong vacuum coupling (right).Credit: Alfonso Lanuza/Schneble Lab/Stony Brook University.According to Schneble and his colleagues, the polaron study they published completely circumvents this limitation caused by spontaneous decay.The photonic aspects of their polarons are carried entirely by atomic matter waves, for which there is no such unwanted decay process.This feature allows access to parameter states that are inaccessible or not yet available in the photon-based polarization subsystem.The development of quantum mechanics has dominated the last century, and there is now a global debate on the development of QIST and its applications.The Second Quantum Revolution”Including IBM, Google and Amazon,” said Schneble, a professor in the department of physics and Astronomy in the College of Arts and Sciences.Our work highlights some of the fundamental quantum mechanical effects of interest in emergent photon quantum systems in QIST, from semiconductor nanophotonics to circuit quantum electrodynamics.The Stony Brook researchers conducted their experiments on a platform with ultra-cold atoms in an optical lattice, an egg-box of potential landscapes formed by standing wave light.Using specialized vacuum equipment with various lasers and control fields operating at nanokelvin temperatures, they achieved a scenario in which atoms trapped in a lattice “decked out” a vacuum excitation cloud made of fragile, transient waves of matter.As a result, the polaron particles became more mobile, the team found.The researchers were able to directly probe the internal structure of the lattice by gently shaking it, gaining contributions from matter waves and atomic lattice excitation.When left alone, matter wave polarons jump through the lattice and interact to form a stable phase of quasiparticle matter.”Through our experiments, we have performed quantum simulations of the exciton-polarization subsystem in a novel regime, “Schneble explains.Perform this kind of 'Simulation & # 39;The pursuit of simulation, in addition, is 'Simulation & # 39;, because related parameters can be dialed in freely, this is itself an important direction in QIST.The Stony Brook study included graduate students Joonhyuk Kwon (currently a postdoctoral fellow at Sandia National Laboratories), Youngshin Kim, and Alfonso Lanuza.