Quantum Technology - ExperimentCopyright: Tim Botzem
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.
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.
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.