Compact 3D quantum memory

Abstract

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

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• Observation of Josephson Harmonics in Tunnel Junctions
• Experimental quantum teleportation of propagating microwaves
• The scattering coefficients of superconducting microwave resonators: I. Transfer-matrix approach
• Impacts of Noise and Structure on Quantum Information Encoded in a Quantum Memory
• Comparison of Quantum PUF models
• Superefficient cascade multiresonator quantum memory
• Distinguishing Dirac from Majorana neutrinos in a microwave cavity