用于量子信息处理的位点可控量子点.pdf

1、Emanuele PelucchiSite-Controlled Quantum Dots for Quantum Information ProcessingEpitaxy and Physics of Nanostructures,Tyndall National Institute,University College Cork,Lee Maltings,Dyke Parade,Cork,Ireland Tyndall ICT,Photonics,Quantum etc.From Atoms to SystemsFields(quantum is all about fields).an

2、d yes you can send half a photon left and half a photon rightand it is a superposition of one and zero,not“nearly”)Why QDs after all they need cryogenicsGoogle AI saysQuantum dots are valuable in quantum information processing because they can act as both a source of single photons(for photonic quan

3、tum information)and a platform for realizing qubits(for quantum computing),offering advantages like compatibility with semiconductor technology and potential for scalability.They are truly atomic like,and that can be very useful.Especially on entanglement“Perfect”source may be.Possible requirements

4、for the QD-based integrated circuits:Position controlEmission energy uniformitySpectral purityHigh symmetrySource brightnessTrue single photon emissionCoherent emission over several repetitionsElectrical injectionPhotons on-demandConditions for photon indistinguishabilityg(2)=0 for a realistic syste

5、mPolarization-entangled photon emissionQD integration and scalabilityEfficient operation(111)B substrate patterning;(photo)lithography+wet etchingMOVPE growth:QW likePost processing to enhance extraction“apex up”or“back etching”,prevents total internal reflectionGaAs(111)BSiO2Photoresist(111)AInGaAs

6、 QDPolydimethylsiloxane(PDMS)engineered injectionVQWR.ElectroluminescenceTriggered entangled photon emissionBiExcitonic State:2X,two degenerate levels BiExcitonic State:2X,two degenerate levels antisimmetricly arrangedantisimmetricly arrangedExcitonic State:XExcitonic State:XGrou