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Scientists discover a new setting for strange metals and quantum criticality

2020-03-05

On5thMarch2020,NaturereportedthediscoveryofaquantumcriticalpointandstrangemetalbehaviorintheferromagnetCeRh6Ge4,fromastudyledbyHuiqiuYuanattheCenterforCorrelatedMatterandDepartmentofPhysics,ZhejiangUniversity.Thefindingsoverturntheprevailingbeliefthatferromagneticquantumcriticalpointsdonotexistinnature,andestablishtheexistenceofanenigmatic“strangemetal”phaseinanewsetting,thatofferromagneticmaterials.Thestudyofphasetransitionshasbeenacornerstoneofmodernphysics,whetheritbeunderstandingthefreezingo
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Tunable Nonreciprocal Quantum Transport through a Dissipative Aharonov-Bohm Ring in Ultracold Atoms

2020-02-25

WeiGou,TaoChen,DizhouXie,TengXiao,Tian-ShuDeng,BryceGadway,WeiYi,andBoYanWereporttheexperimentalobservationoftunable,nonreciprocalquantumtransportofaBose-Einsteincondensateinamomentumlattice.ByimplementingadissipativeAharonov-Bohm(AB)ringinmomentumspaceandsendingatomsthroughit,wedemonstrateadirectionalatomflowbymeasuringthemomentumdistributionofthecondensateatdifferenttimes.WhilethedissipativeABringischaracterizedbythesyntheticmagneticfluxthroughtheringandthelaser-inducedlossonit,boththepropagat
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Controllable Switching between Superradiant and Subradiant States in a 10-qubit Superconducting Circuit

2020-01-07

ZhenWang,HekangLi,WeiFeng,XiaohuiSong,ChaoSong,WuxinLiu,QiujiangGuo,XuZhang,HangDong,DongningZheng,H.Wang,andDa-WeiWangSuperradianceandsubradianceconcerningenhancedandinhibitedcollectiveradiationofanensembleofatomshavebeenacentraltopicinquantumoptics.However,precisegenerationandcontrolofthesestatesremainchallenging.Herewedeterministicallygenerateupto10-qubitsuperradiantand8-qubitsubradiantstates,eachcontainingasingleexcitation,inasuperconductingquantumcircuitwithmultiplequbitsinterconnectedbyaca
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A termination-insensitive and robust electron gas at the heterointerface of two complex oxides

2019-09-20

MengZhang,KaiDu,TianshuangRen,HeTian*,ZeZhang,HaroldY.HwangYanwuXie*Thesingle-crystalSrTiO3(001)hastwodifferentsurfaceterminations,TiO2andSrO.OnemostremarkableobservationinpreviousstudiesisthatonlytheheterointerfaceswithTiO2-terminatedSrTiO3,whichusuallycombineswithpolaroxidessuchasLaAlO3,hostanelectrongas.Hereweshowthatarobustelectrongascanbegeneratedbetweenanon-polaroxide,CaHfO3,andSrTiO3(001)witheithertermination.Unlikethewell-knownelectrongasofLaAlO3/SrTiO3,thepresentoneofCaHfO3/SrTiO3essent
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Quantum computation with universal error mitigation on a superconducting quantum processor

2019-09-09

ChaoSong1,JingCui1,H.Wang1,J.Hao2,H.Feng2andYingLi3*Medium-scalequantumdevicesthatintegrateabouthundredsofphysicalqubitsarelikelytobedevelopedinthenearfuture.However,thesedeviceswilllacktheresourcesforrealizingquantumfaulttolerance.Therefore,themainchallengeofexploringtheadvantageofquantumcomputationistominimizetheimpactofdeviceandcontrolimperfectionswithoutcompletelogicalencoding.Quantumerrormitigationisasolutionsatisfyingtherequirement.Here,wedemonstrateanerrormitigationprotocolbasedongatesett
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Generation of multicomponent atomic Schrödinger cat states of up to 20 qubits （reported by Science)

2019-08-09

Thepublishedarticleisavailableathttps://science.sciencemag.org/content/365/6453/574
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Topological characterizations of an extended Su–Schrieffer–Heeger model

2019-06-04

DizhouXie,WeiGou,TengXiao,BryceGadwayBoYanTheSu–Schrieffer–Heeger(SSH)modelperhapsistheeasiestandthemostbasicmodelfortopologicalexcitations.ManyvariationsandextensionsoftheSSHmodelhavebeenproposedandexploredtobetterunderstandbothfundamentalandnovelaspectsoftopologicalphysics.TheSSH4modelhasbeenproposedtheoreticallyasanextendedSSHmodelwithhigherdimension(theinternaldimensionchangesfromtwotofour).Ithasbeenproposedthatthewindingnumberinthissystemcanbedeterminedthroughahigher-dimensionalextensionoft
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Synthesis of antisymmetric spin exchange interaction and chiral spin clusters in superconducting circuits

2019-01-22

Da-WeiWang,ChaoSong,WeiFeng,HanCai,DaXu,HuiDeng,HekangLi,DongningZheng,XiaoboZhu,H.Wang,Shi-YaoZhuMarlanO.ScullyAccordingtoquantummechanics,chiralstatescannotbenon-degenerateeingenstatesofaparity-conservingHamiltonian.Thisisincontradictiontotheexistenceofchiralmolecules—afactknownasastheHundparadox1.Theoriginofmolecularandbiologicalchiralityisconjecturedtoberelatedtoparity-breakinginteractions2,3orenvironmentaldecoherence4,butaquantumsuperpositionoftwochiralmolecularstateswithdistinctiveopticala
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Scientists at Zhejiang University find evidence for Weyl fermions in a heavy fermion system

2018-11-06

On November 5th, 2018, Nature Communications reported evidence for Weyl fermions in the heavy-fermion semimetal YbPtBi, which provides a new platform for studying the interplay of topology and electron correlations, as well as topological quantum phase transitions.
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Intrinsic defect engineering - a new approach for realizing topological crystalline insulators

2018-08-08

The discovery of topological insulators (TIs) not only enhanced peoples’ understanding of condensed matter, but also revealed TIs to be promising prospects for applications in dissipationless electronic and spintronic devices and quantum computing due to their exotic properties. TIs are insulating in the bulk, just like trivial insulators, but boast conducting surface/edge states which are protected by time reversa
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