Effects on Noise on Quantum System using non-Markovian QSD Alif KM Akbar Wibowo, Jusak Sali Kosasih
Institut Teknologi Bandung
Abstract
In quantum information, quantum entanglement and quantum coherence holds an important role. In preserving the entanglement or the coherence, noise will be taken into account. It happens when a measurement is applied into a quantum system or simply due to the environment surrounding a quantum system. It is important to note that this note will affect the system, namely the entanglement or the coherence. As we know when the system is isolated, the entanglement or coherence would break. However, it is recently known that in a noisy environment, a measurement would instead protect the system. We consider two-level system coupled to an external environement. The Hamiltonian of the system is described by the Jaynes-Cummings model coupled to a bosonic bath. The noise affecting the system is described using stochastic method in the form of Non-Markovian Quantum State Diffusion. We conclude that the higher the H, the faster the state breaks. In contrast, the stronger the noise, the longer it takes for the system to break. This concludes that noise can preserve the system
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