Quantum memory with millisecond coherence in circuit QED

By M. Reagor, W. Pfaff, C. Axline, R. Heeres, N. Ofek, K. Sliwa, E. Holland, Chen Wang, J. Blumoff, K. Chou and 5 more. 2015

328 citations recorded by the source corpus.

Significant advances in coherence render superconducting quantum circuits a viable platform for fault-tolerant quantum computing. To further extend capabilities, highly coherent quantum systems could act as quantum memories for these circuits. A useful quantum memory must be rapidly addressable by Josephson-junction-based artificial atoms, while maintaining superior coherence. We demonstrate a superconducting microwave cavity architecture that is highly robust against major sources of loss that are encountered in the engineering of circuit QED systems. The architecture allows for storage of quantum superpositions in a resonator on the millisecond scale, while strong coupling between the resonator and a transmon qubit enables control, encoding, and readout at MHz rates. This extends the maximum available coherence time attainable in superconducting circuits by almost an order of magnitude compared to earlier hardware. Our design is an ideal platform for studying coherent quantum optics and marks an important step towards hardware-efficient quantum computing in Josephson-junction-based quantum circuits.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/f891358d09f3c3ccdf5aa7c618e1844b994ca0ab

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Fast universal control of an oscillator with weak dispersive coupling to a qubit (2021, background): “On the other hand, oscillator dephasing at a rate κφ indeed causes enhanced diffusion-like terms at an effective rate 2|α(t)|(2)κφ in the displaced frame (see Methods), but oscillators such as superconducting cavities can have dephasing rates much smaller than their relaxation rates [25].”
Efficient Multiphoton Sampling of Molecular Vibronic Spectra on a Superconducting Bosonic Processor (2019, background): “Modest improvements in cavity lifetimes [39,40] and further circuit optimization for engineering the bilinear interactions [31] can reduce the error rate of the squeezing and beam splitter”
Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits (2017, background): “This is advantageous as coherence times in microwave cavities currently exceed those in superconducting qubits [65].”
Quantum information processing and quantum optics with circuit quantum electrodynamics (2020, unknown): “1c 17 .”