Open posi­ti­ons

For posi­ti­ons at Fer­di­nand-Braun Insti­tut, plea­se visit: fbh​-ber​lin​.de/​k​a​r​r​i​ere

We wel­co­me inqui­ries for Post­docs, Ph.D. stu­dents, and visi­ting sci­en­tists joi­ning our team. Various posi­ti­ons may beco­me available at any time. Inte­res­ted can­di­da­tes should cont­act us.


Bache­lor / Mas­ter The­sis: Imple­men­ta­ti­on of a laser sys­tem for alka­li vapor MEMS cell acti­va­ti­on

Pro­ject descrip­ti­on
We are loo­king for moti­va­ted Bache­lor or Mas­ter Stu­dents to work with us on opti­cal fre­quen­cy refe­ren­ces using ato­mic rubi­di­um. The goal of this the­sis is to deve­lop a set­up for acti­vat­ing micro-inte­gra­ted Rb vapor spec­tro­sco­py cells, i.e. releasing ele­men­ta­ry rubi­di­um from a Rb dis­pen­ser pill by a high power laser. The­se cells shall be used in opti­cal ato­mic clocks based on two-pho­ton spec­tro­sco­py of rubi­di­um for poten­ti­al appli­ca­ti­ons in space mis­si­ons.

As a Bache­lor or Mas­ter stu­dent working on this pro­ject at the HU, your tasks can include:

  • Set­up and cha­rac­te­riza­ti­on of two lasers ope­ra­ting at 780 nm and 1064 nm, respec­tively.
  • Buil­ding an opti­cal sys­tem that uses the­se lasers and a came­ra sys­tem to per­form the MEMS cell acti­va­ti­on.
  • Rea­li­zing com­pu­ter con­trol of the expe­ri­men­tal set­up, such as trans­la­ti­on stages, image acqui­si­ti­on, and laser con­trol.
  • Con­duc­ting initi­al expe­ri­ments on MEMS cell acti­va­ti­on with samples pro­du­ced at the FBH and deve­lo­ping appro­pria­te pro­to­cols for mea­su­re­ment and acti­va­ti­on.
  • Explo­ring in-situ absorp­ti­on spec­tro­sco­py tech­ni­ques during the acti­va­ti­on pro­cess and per­forming initi­al tri­al runs.
  • Eva­lua­ting key per­for­mance para­me­ters of the set­up and the acti­va­ted MEMS cells.

Within this work you will learn about the design of laser sys­tems, optics and ima­ging, laser spec­tro­sco­py and ato­mic phy­sics as well as com­pu­ter con­trol of expe­ri­men­tal set­ups. You will ther­eby gain hands on expe­ri­ence in expe­ri­men­tal opti­cal sci­ence with cut­ting edge tech­no­lo­gy.

While a back­ground in Laser Phy­sics, Ato­mic Phy­sics, Spec­tro­sco­py, or Opti­cal Tech­no­lo­gies is desi­ra­ble, it is not man­da­to­ry for this work. If you are pas­sio­na­te and eager to learn, we encou­ra­ge you to app­ly. If you have any ques­ti­ons or are inte­res­ted in this oppor­tu­ni­ty, plea­se don’t hesi­ta­te to reach out to us.

M.Sc. J. Klu­ge: juli­enatphy​sik​.hu​-ber​lin​.de
Dr. K. Dörings­hoff: kdoe­r­ingatphy​sik​.hu​-ber​lin​.de
Dr. M. Krut­zik: markus.krutzikatphy​sik​.hu​-ber​lin​.de


Mas­ter The­sis (Theo­ry): Uncer­tain­ty rela­ti­ons in quan­tum-opti­cal light-mat­ter inter­ac­tions

Pro­ject descrip­ti­on
Modern quan­tum sen­sors on the basis of ultra-cold atoms allow for an unpre­ce­den­ted expe­ri­men­tal accu­ra­cy and have shown to be useful in fun­da­men­tal sci­ence and real-world appli­ca­ti­ons ali­ke. With the pur­su­it of minia­tu­riza­ti­on and advan­cing expe­ri­men­tal fines­se, test­ing the boun­da­ries of what theo­re­ti­cal phy­sics can pre­dict has beco­me via­ble. In this mas­ter pro­ject, we will ask the ques­ti­on, what are the fun­da­men­tal uncer­tain­ties in using ato­mic quan­tum sen­sors? Cle­ar­ly, the Hei­sen­berg uncer­tain­ty rela­ti­on is one part of the sto­ry. But it lea­ves the effects of, say, tem­pe­ra­tu­re, mate­ri­al-modi­fied vacu­um fluc­tua­tions and com­pli­ca­ted sys­tem-bath cou­plings in none­qui­li­bri­um situa­tions sim­ply untouch­ed. Due to the lat­ter, the pre­cis­i­on that is actual­ly achie­ved often exceeds Heisenberg’s rela­ti­on. We aim to explo­re that dis­crepan­cy.

Working with us, you will learn more about:
Quan­tum Vacu­um and its macro­sco­pic effects
Light-mat­ter inter­ac­tion and none­qui­li­bri­um sta­tis­ti­cal phy­sics
Sol­ving equa­tions (asym­pto­ti­cal­ly) in order to gain phy­si­cal intui­ti­on

Open­ness to work with ana­ly­ti­cal as well as nume­ri­cal mathe­ma­ti­cal tools. Solid back­ground in theo­re­ti­cal phy­sics, in par­ti­cu­lar quan­tum mecha­nics, sta­tis­ti­cal phy­sics, and elec­tro­dy­na­mics, is hel­pful.

Dr. Dani­el Rei­che: rei­cheatphy​sik​.hu​-ber​lin​.de
Dr. Mar­kus Krut­zik: markus.krutzikatphy​sik​.hu​-ber​lin​.de

Peo­p­le with an inter­na­tio­nal histo­ry or diver­se back­ground and iden­ti­ty are spe­ci­fi­cal­ly encou­ra­ged to app­ly.


Ber­lin School of Opti­cal Sci­en­ces & Quan­tum Tech­no­lo­gies (BOS.QT)

BOS.QT is a joint Gra­dua­te School of the Phy­sics Depart­ments of Hum­boldt-Uni­ver­si­tät zu Ber­lin, the Tech­ni­sche Uni­ver­si­tät Ber­lin and Freie Uni­ver­si­tät Ber­lin in part­ner­ship with renow­ned Ber­lin rese­arch insti­tu­tes of the Leib­niz Asso­cia­ti­on, the Ger­man Aero­space Cen­ter (DLR), the Max-Born-Insti­tu­te, the Fraun­ho­fer such as the Max-Planck-Socie­ty and offers a wide ran­ge of aca­de­mic trai­ning and an excel­lent rese­arch envi­ron­ment for acqui­ring a doc­to­ral degree in natu­ral sci­en­ces (Dr. rer. nat.) at one of the par­ti­ci­pa­ting uni­ver­si­ties.

For the sum­mer term 2022 the fol­lo­wing posi­ti­ons are open:

  • Com­pact Opti­cal Clocks and Ato­mic Sen­sors
    Hum­boldt Uni­ver­si­tät zu Ber­lin and Fer­di­nand-Braun-Insti­tu­te gGmbH
    Cont­act: Dr. Mar­kus Krut­zik (markus.krutzikatphy​sik​.hu​-ber​lin​.de)

Fur fur­ther infor­ma­ti­on on the job descrip­ti­on see: https://​blogs​.tu​-ber​lin​.de/​i​o​a​p​_​b​o​s​q​t​/​j​obs
Suc­cessful appli­cants can also app­ly for a mem­ber­ship to BOS.QT.