Spatial correlations of bitphoton states

Sondenheimer Junior Group

Theory of optical quantum information (TOQI)
Spatial correlations of bitphoton states
Image: René Sondenheimer

Research areas

Simulation of resource states

Simulation of resource states

Image: René Sondenheimer

Protocols for generating resource states

Quantum resource states such as Schrödinger cat states, entangled coherent states, and biphoton states are an integral part of various quantum technologies such as quantum computing, quantum metrology, quantum imaging, and quantum sensing. For example, cat states enable the precision measurement of physical quantities beyond classical limits in metrology, while they can be used for quantum error correction in quantum computing. Entangled coherent states, in which multiple light modes are entangled with each other, increase the sensitivity of measuring instruments by reducing the effects of quantum noise. These states are particularly useful because they enable the detection of previously invisible details and improve the detection of weak signals. In our working group, we are developing protocols for the efficient generation of such resource states and researching potential applications.

 

Schema Gaussian Boson Sampler

Image: René Sondenheimer

Quantum simulations

In the field of photonic quantum simulations, our group focuses specifically on Gaussian boson sampling. This method enables us to simulate complex quantum systems and investigate phenomena that cannot be analyzed efficiently with classical computers. It is based on the principle of quantum interference of photons. Our research aims to use Gaussian boson sampling to gain insights into quantum chemistry and complex optimization problems.

 

Quantum imaging

Quantum imaging based on “undetected photon schemes” is an innovative technique that can be used to generate images of photons that have not interacted with the object. This technique uses correlated photon pairs, in which only one of the two photons interacts with the object being examined. The other photon, which has not interacted with the object, is measured instead. Due to the correlation between the two photons, information about the object can be obtained from the measurements of the undetected photon. This makes it possible to obtain information about the object that would not be accessible with traditional imaging methods, such as the structure of light-sensitive materials or biological samples, without damaging them.

René Sondenheimer, Dr

Junior group leader
Institut für Festkörpertheorie und -optik
René Sondenheimer
Image: René Sondenheimer
Room 107
Helmholtzweg 5
07743 Jena Google Maps site planExternal link

Team members 

Associated team members