Quantum memory is a fundamental component for many quantum computingalgorithms. A quantum system owing electromagnetically induced transparency(EIT) enjoys the slow light and the trapped light phenomena, and could becapable of storing information carried by photons. Our current MOST fundedproject is to explore EIT and to develop EIT-based quantum memory insuperconducting circuits. We propose to continue this research work for thefollowing three-year proposed project.The main obstacle for EIT-based superconducting quantum memory comes fromthat superconducting artificial atoms typically do not favor Λ-type dipole-allowedtransition level structure. In this proposal, we suggest two new feasible Λ-typeschemes for realizing EIT in superconducting circuits. In the first scheme, we planto use the fact that the transition frequency of a transmon atom can be quicklymodulated by an AC magnetic field. This strategy can open a new transitionchannel, transform transmon systems into artificial atoms with Λ-type energylevel structure, and create suitable EIT platform. The required metastable excitedstate in Λ-type scheme can be achieved by using the subradiance state of twodirectly coupled transmons. In the second scheme, we plan to operate atransmon + resonator system in nesting regime via pumping the system near thetransmon transition frequency. The pump power is regulated to let the dressedstates have equal-weight superposition from the transmon ground state andexcited state. The dressed states of the pumped system form Λ-type levelstructure with appropriate coherence property for EIT. We will then perform slowlight characterization and trapped light demo on successful Λ-type EIT schemes.We will further carry out quantum memory operations, including writing, storing,and reading, with classical light pulse as information carrier. The advance ofquantum memory development from this project will further rush the progressesof quantum information processing in superconducting circuits.
|Effective start/end date
|1/08/21 → 31/07/22
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):