Quantum Coherence Lab

Zumbühl Group

 
 
 

Research

Our research focuses on quantum transport experiments investigating quantum coherence, electron spins and nuclear spins and interactions in semiconductor and graphene nanostructures.

Ongoing projects include

  • spin qubits in coupled, laterally gated GaAs quantum dots
  • microkelvin temperatures in nanoscale sample
  • novel quantum states of matter, such as electron or nuclear spin helices, topological states and Majorana fermions
  • spin-orbit coupling in GaAs quantum wells
  • experiments investigating mesoscopic electron transport, including graphene nanoribbon research

We are interested in coherent manipulation of individual quantum systems in solid state nanostructures with quantum computation as a long term goal.

Experiments investigate quantum transport through semiconductor nanostructures which are fabricated in house using high mobility 2D electron gas materials obtained from collaborating molecular beam epitaxy labs. Experiments are typically performed in dilution refrigerators at millikelvin temperatures in magnetic fields. Measurements are done using electronic low-noise techniques and may involve nanosecond-pulsing and microsecond readout schemes.

  

Affiliations

We are affiliated with 

Our group enjoys numerous ongoing collaborations, including the following groups (in arbitrary order):

 

Upcoming Events

20 Okt 13:15

1.09

No Group Meeting

27 Okt 13:15

1.09

No Group Meeting

3 Nov 13:15

1.09

Florian

10 Nov 12:35

1.09

Taras

  

News from the Departement

Quantum sensors decipher magnetic ordering in a new semiconducting material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

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Using mirrors to improve the quality of light particles

Scientists from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute have succeeded in dramatically improving the quality of individual photons generated by a quantum system. The scientists have successfully put a 10-year-old theoretical prediction into practice. With their paper, published recently in Physical Review X, they have taken an important step towards future applications in quantum information technology.

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High-speed quantum memory for photons

Physicists from the University of Basel have developed a memory that can store photons. These

quantum particles travel at the speed of light and are thus suitable for high-speed data transfer.

The researchers were able to store them in an atomic vapor and read them out again later without

altering their quantum mechanical properties too much. This memory technology is simple and

fast and it could find application in a future quantum Internet. The journal Physical Review Letters

has published the results.

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