Quantum systems are becoming increasingly important for technological innovations in information processing, cryptography, photonics, spintronics, and high-performance computing. They are in constant interaction with their environment. It influences their modes of operation in many respects. University of Bayreuth and Universities of Edinburgh and St. Andrews scientists have developed a novel algorithm to simulate and calculate these influences. The study was published in Nature Physics. The study is ground-breaking for the understanding of open quantum systems.
Scientists call their algorithm Automated Compression of Environments (ACE). Scientists achieved a breakthrough in the simulation of quantum systems, with this development. This is because it is of extremely high relevance for high-tech applications of quantum systems to be able to realistically simulate environmental influences. Scientists expect that the new method will lead to many valuable insights into technologically relevant quantum systems. It will certainly also pave the way for the development of new quantum algorithms and for the control of quantum systems.
The new algorithm is characterized by a high degree of flexibility. It is able to describe several different environmental effects together on a microscopic level. The new algorithm also overcomes a number of limitations faced by previous methods for simulating and calculating external influences on quantum systems. ACE enables a virtually unlimited range of applications. It can be applied equally to bosonic, fermionic, or spin environments. The influences of Gaussian and non-Gaussian environments, linear and non-linear environments, and diagonal and non-diagonal environments can now be simulated equally with high precision.