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1、physicsworld.comQuantumfrontiers:WeakmeasurementCCBYTimmWeitkampInpraiseofweaknessQuantumphysicsisbeingtransformedbyaradicalnewconceptualandexperimentalapproachknownasweakmeasurementthatcandoeverythingfromtacklingbasicquantummysteriestomappingthetrajecto
2、riesofphotonsinaYoung’sdouble-slitexperiment.AephraimSteinberg,AmirFeizpour,LeeRozema,DylanMahlerandAlexHayatunveilthepowerofthisnewtechnique“Thereisnoquantumworld,”claimedNielsBohr,“Observations,”heoncewrote,“notonlydisturbAephraimoneofthefoundersofquan
3、tummechanics.Thispow-whatistobemeasured,theyproduceit.”WhatJor-Steinberg,erfultheory,thoughitunderliessomuchofmoderndanmeantisthatthewavefunctiondoesnotdescribeAmirFeizpour,scienceandtechnology,isanabstractmathematicalreality,butonlymakesstatisticalpredi
4、ctionsaboutLeeRozema,descriptionthatisnotoriouslydifficulttovisualizepotentialmeasurements.Asfarasthewavefunc-DylanMahlerandAlexHayatareatthe–somuchsothatBohrhimselffeltitamistaketotionisconcerned,Schrödinger’scatisindeed“aliveCentreforQuantumeventry.Ofc
5、ourse,therearerulesthatletusextractanddead”.OnlywhenwechoosewhattomeasureInformationandfromthemathematicssomepredictionsaboutwhatmustthewavefunction“collapse”intoonestateorQuantumControlwillhappenwhenwemakeobservationsormeasure-another,tousethelanguageof
6、theCopenhagenandtheDepartmentments.ToBohr,theonlyrealtaskofphysicswastointerpretationofquantumtheory.ofPhysics,Universitymakethesepredictions,andthehopeofactuallyelu-Overthelast20years,however,anewsetofideasofToronto,Canada,cidatingwhatis“reallythere”whe
7、nno-oneislookingaboutquantummeasurementhaslittlebylittlebeene-mailsteinberg@wasnonsense.Weknowhowtopredictwhatyouwillgainingafootholdinthemindsofsomephysicists.physics.utoronto.caseeifyoulook,butifyoudonotlook,itmeansnoth-Knownasweakmeasurement,thisnovel
8、paradigmingtoask“WhatwouldhavehappenedifIhad?”.hasalreadybeenusedforinvestigatinganumberofTheGermantheoristPascualJordanwentfurther.basicmysteriesofquantummechanics.AtamorePhysicsWorldMarch201335Quantumfrontiers:Weakmeasur
