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RWTH Aachen - QuTech, RWTH Aachen University, Germany

We are looking for a motivated postdoctoral researcher paving the way towards industry-compatible qubit device fabrication and a 2x20 electron-spin qubit.

We are a young group consisting of four PostDocs, 15 PhD students and multiple Master- and Bachelor students subdivided in two larger subgroups led by Professor Hendrik Bluhm and Dr. Lars Schreiber focusing on GaAs and silicon-based material systems, respectively. In silicon quantum computation we cooperate with IKZ, IHP, Regensburg University, TU Delft, imec and IP PAS. Mixed task responsibilities, frequent group meetings and group internal seminars share wisdom and knowledge among all group members, while general academic innovations and state-of-the-art are covered by weekly journal clubs. Apart the regular work hours, we arrange multiple pub crawls and institute-retreats including skiing, sailing trips and sport events.

The 2nd institute of physics incorporates multiple different research activities focusing on solid-states experimental physics including quantum technology and 2D materials such as graphene-based research as well as topological insulators. The overall institute provides extensive expertise in low temperature measurements using more than ten cryostats including inhouse helium liquification. Sample fabrication is done in two major cleanroom facilities namely the Central Laboratory for Micro- and Nanotechnology at RWTH and the Helmholtz Nano Facility at FZJ providing together more than 1500 m2 . Further, the quantum technology group represents the experimental part of the overall Jülich-Aachen-Research-Alliance Institute for Quantum Information (JARA-IQI), which is a research collaboration between RWTH Aachen University and Forschungszentrum Jülich (FZJ). On the theoretical side within JARA-IQI, groups focus on general quantum information (lead by Prof. David DiVincenzo, Prof. B. Terhal and Prof. F. Hassler).  

Researcher (w/m/d)

Work­ing field:

This 3-year pro­ject focu­ses on the employ­ment of high-yield fabri­ca­tion tech­ni­ques to demons­trate and cha­rac­te­rize mul­ti­ple elec­tron spin qubits in two par­al­lel quan­tum dot chains. Our pro­ject in close col­la­bo­ra­tion with the RWTH insti­tute of semi­con­duc­tor tech­no­logy (hea­ded by Prof. Joa­chim Knoch) aims at an unpre­ce­den­ted 2x20 quan­tum dot device in a SiGe hete­ro­st­ruc­ture. All neigh­bo­ring qubits can be tun­nel cou­pled by tuning the indi­vi­dual intra- and inter poten­tial bar­ri­ers of each chain. Indu­cing qubits in one chain and a sin­gle elec­tron tran­sis­tor in the other, the inter­chain cou­pling can be tuned to be capa­ci­tive allo­wing elec­tron spin read-out. The gate struc­ture con­sists of two large scree­ning gates and a second gate layer of metal­lic fine gates. The under­ly­ing gate fabri­ca­tion tech­ni­que is based on the self-ali­gned spa­cer pro­cess in com­bi­na­tion with metal­li­za­tion and a damas­cene pro­cess (Klos, J. et al., Appl. Sci. 2019, 9, 3823), which is exten­si­vely used in indus­try and fun­da­ment­ally dif­fe­rent from the tra­di­tio­nally used lift-off pro­cess. Using this tech­no­logy, a high den­sity gate pat­tern of 30 nm insu­la­ted super­con­duc­ting gates on a 45 nm pitch can be fabri­ca­ted in a sin­gle layer.

Com­bi­ning the deve­lop­ment of appro­priate fabri­ca­tion tech­no­lo­gies to faci­li­tate ground­brea­king work on multi quan­tum dot/qubit devices, the approach has the poten­tial to pro­vide highly rele­vant con­tri­bu­ti­ons to the sci­ence and tech­no­logy of the field. This inclu­des detailed sta­tis­ti­cal cha­rac­te­ri­za­tion of charge noise and local val­ley split­ting, the auto­ma­ted tuning of mul­ti­ple quan­tum dots and per­forming sin­gle and two-qubit gates with high fide­lity on a multi qubit device. Fur­ther­more, since the tech­no­logy deve­lop­ment will be as close as pos­si­ble to cur­rent indus­trial pro­ces­ses it may help acce­le­ra­ting the rea­li­za­tion of future quan­tum infor­ma­tion pro­ces­sors.

The selec­ted can­di­date is expec­ted to focus their rese­arch on one or more of the fol­lo­wing areas:
  • Device design and fabri­ca­tion in local clean-room.
  • Cha­rac­te­ri­za­tion of the devices inclu­ding trans­port mea­su­rements at 10 mK.
  • Cha­rac­te­ri­za­tion of the per­for­mance of qubits loca­ted wit­hin the quan­tum dot chain.
  • Design and exe­cu­tion of pro­to­cols for the ope­ra­tion of the device.
  • Gate tuning auto­ma­tiza­tion.

Require­ments:

App­li­cants must have a doc­to­rate/Ph.D. or equi­va­lent.
App­li­ca­tion are wel­come from indi­vi­du­als who have:
  • A PhD in Phy­sics or Engi­nee­ring Sci­en­ces and strong publi­ca­ti­ons in expe­ri­men­tal phy­sics, quan­tum com­pu­ta­tion or rela­ted fields.
  • Expe­ri­ence in elec­tri­cal cha­rac­te­ri­za­tion of devices at cryo­ge­nic tem­pe­ra­ture, and clean-room expe­ri­ence is highly appre­cia­ted

How to ap­ply:

The pos­i­tion is 3 years and is to be filled as soon as pos­sible. This is a full-time pos­i­tion.

The salary cor­res­ponds to level EG 13 TV-L.

RWTH Aachen Uni­versity is cer­ti­fied as a "Fam­ily-Friendly Uni­versity". We wel­come applic­a­tions from all suit­ably qual­i­fied can­did­ates regard­less of gender. We par­tic­u­larly wel­come and encour­age applic­a­tions from women, dis­abled per­sons and eth­nic minor­ity groups, recog­niz­ing they are under­rep­res­en­ted across RWTH Aachen Uni­versity. The prin­ciples of fair and open com­pet­i­tion apply and appoint­ments will be made on merit. RWTH Aachen is an equal oppor­tun­it­ies employer. We there­fore ask you not to include a photo in your applic­a­tion. For inform­a­tion on the col­lec­tion of per­sonal data pur­su­ant to Art­icles 13 and 14 of the Gen­eral Data Pro­tec­tion Reg­u­la­tion (GDPR), please visit: http://www.rwth-aachen.de/dsgvo-information-bewerbung

For fur­ther details, please con­tact
Dr. Lars Schreiber
Tel.: +49 (0) 241 80 24486
Email: lars.schreiber@physik.rwth-aachen.de

or
Prof. Dr. Hendrik Bluhm
Tel.: +49 (0) 241 80 27110
Email: bluhm@physik.rwth-aachen.de

For fur­ther inform­a­tion, please visit our web­site at:
http://www.quantuminfo.physik.rwth-aachen.de/cms/Quantuminfo/Forschung/~xwpl/

Please send your applic­a­tion by Feb­ru­ary 29, 2020 to
RWTH Aachen Uni­versity
II. Physikalisches Insti­tut C
Prof. Dr. Hendrik Bluhm
Otto-Blu­menthal-Straße 28
DE-52074 Aachen

You can also send your applic­a­tion via email to lars.schreiber@physik.rwth-aachen.de. Please note, however, that com­mu­nic­a­tion via unen­cryp­ted e-mail poses a threat to con­fid­en­ti­al­ity as it is poten­tially vul­ner­able to unau­thor­ized access by third parties.