Z2 quantum memory implemented on circuit quantum electrodynamics

• Main Authors: Kwek, Leong Chuan, Kyaw, T. H., Felicetti, S., Romero, G., Solano, E.
• Other Authors: Meyers, Ronald E.
• Format: Conference or Workshop Item
• Language: English
• Published: 2015
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Microelectronics
• Online Access: https://hdl.handle.net/10356/106710; http://hdl.handle.net/10220/25125
• Institution: Nanyang Technological University

We present a technique to store and retrieve single- and two-qubit states into a parity-protected quantum memory implemented on a state-of-the-art superconducting circuit architecture. Our proposal relies upon a specific superconducting circuit design that permits a tunable qubit-resonator coupling strength. The latter allows us to adiabatically tune from the weak coupling to the ultrastrong coupling regime of light-matter interaction, where a controllable and well-protected effective two-level system is defined due to the Z2 parity symmetry. Storage and retrieval time of the qubit are in a few nanoseconds timescale, which is far below the effective qubit coherence time.