2020/05/31 by V. R. Krithika, Soham Pal, rejish nath gopinathan rejani +2
Chemistry · Computer Science · Physics and Astronomy · #Atomic physics #Chemistry #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum entanglement #Quantum mechanics #Quantum simulator #Quantum state #Qubit #Rydberg atom #Rydberg formula #quant-ph
paper · pdf · doi:10.1103/physrevresearch.3.033035
published as Phys. Rev. Research 3, 033035 (2021) · 9 pages, 6 figures
arxiv created 2021/01/08 · openalex publication_date 2021/07/09 · arxiv updated 2021/07/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We experimentally emulate interaction induced blockade and local spin freezing in two and three qubit NMR architecture. These phenomena are identical to the Rydberg blockade and Rydberg biased freezing. In Rydberg blockade, the simultaneous excitation of two or more atoms is blocked due to the level shift induced by the strong van der Waal's interaction. In such a strong interaction regime, one can also observe Rydberg biased freezing, wherein the dynamics is confined to a subspace, with the help of multiple drives with unequal amplitudes. Here we drive NMR qubits with specific transition-selective radio waves, while intermittently characterizing the quantum states via quantum state tomography. This not only allows us to track the population dynamics, but also helps to probe quantum correlations, by means of quantum discord, evolving under blockade and freezing phenomena. Our work constitutes experimental simulations of these phenomena in the NMR platform. Moreover, these studies open up interesting quantum control perspectives in exploiting the above phenomena for entanglement generation as well as subspace manipulations.