Compact 3D quantum memory
| Autor: | Michael Fischer, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross, P. Eder, Jan Goetz, Daniel Repp, E. Xie, Michael Renger |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Physics Quantum Physics Multi-mode optical fiber Physics and Astronomy (miscellaneous) business.industry FOS: Physical sciences 02 engineering and technology Transmon 021001 nanoscience & nanotechnology 01 natural sciences Qubit Quantum process 0103 physical sciences Optoelectronics Quantum information Quantum Physics (quant-ph) 010306 general physics 0210 nano-technology business Microwave Coherence (physics) |
| Popis: | Superconducting 3D microwave cavities offer state-of-the-art coherence times and a well controlled environment for superconducting qubits. In order to realize at the same time fast readout and long-lived quantum information storage, one can couple the qubit both to a low-quality readout and a high-quality storage cavity. However, such systems are bulky compared to their less coherent 2D counterparts. A more compact and scalable approach is achieved by making use of the multimode structure of a 3D cavity. In our work, we investigate such a device where a transmon qubit is capacitively coupled to two modes of a single 3D cavity. The external coupling is engineered so that the memory mode has an about 100 times larger quality factor than the readout mode. Using an all-microwave second-order protocol, we realize a lifetime enhancement of the stored state over the qubit lifetime by a factor of $6$ with a fidelity of approximately $80\%$ determined via quantum process tomography. We also find that this enhancement is not limited by fundamental constraints. 5 pages, 4 figures |
| Databáze: | OpenAIRE |
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