Quantum Technology - Experiment

  2 qubits Copyright: © Tim Botzem 4 electrons captured in 4 quantum dots

Hendrik Bluhm GaAs Spin-Qubits

Quantum computing is expected to enable an exponential speedup for certain problems. Implementing a quantum processor requires to replace classical bits with quantum bits (qubits). One possibility for the implementation of such devices are spins in semiconductors. Specificially, this subgroup works in GaAs.

  2 qubits Copyright: © Tim Leonhardt 2 electrons captured in 2 quantum dots

Lars Schreiber SiGe Spin-Qubits

Spin qubits can also be implemented in silicon, especially Si/SiGe heterostructures. Because SiGe contains fewer nuclear spins than GaAs, higher coherence times are expected. Higher coherence times are advantageous because information can be stored and manipulated for much longer.

  4 qubits Copyright: © Moler Group, Stanford University Artistic view of the magnetic field sensor

Hendrik Bluhm Scanning SQUID Microscopy

Scanning SQUID microscopy generates images or local measurements of the magnetic properties such as magnetisation, susceptibility and nonlinear response of a sample by moving a magnetic sensor over the surface of the sample.The sensors we use are superconducting quantum interference devices (SQUIDs) with a very high sensitivity and a spatial resolution on the order of 1 µm.