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Quantum memory with near-millisecond coherence in circuit QED

Matthew Reagor 1 Wolfgang Pfaff 1 Christopher Axline 1 Reinier W. Heeres 2, 1 Nissim Ofek 1 Katrina Sliwa 1 Eric Holland 1 Chen Wang 1 Jacob Blumoff 1 Kevin Chou 1 Michael J. Hatridge 1 Luigi Frunzio 1 Michel H. Devoret 1 Liang Jiang 1 Robert J. Schoelkopf 1 
2 QUANTRONICS - Quantronics Group
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : Significant advances in coherence have made 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 qubits, while maintaining superior coherence. We demonstrate a novel supercon-ducting 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 near-millisecond storage of quantum states in a resonator while strong coupling between the resonator and a trans-mon qubit enables control, encoding, and readout at MHz rates. The observed coherence times constitute an improvement of almost an order of magnitude over those of the best available super-conducting qubits. Our design is an ideal platform for studying coherent quantum optics and marks an important step towards hardware-efficient quantum computing with Josephson junction-based quantum circuits.
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https://hal-cea.archives-ouvertes.fr/cea-01485238
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Matthew Reagor, Wolfgang Pfaff, Christopher Axline, Reinier W. Heeres, Nissim Ofek, et al.. Quantum memory with near-millisecond coherence in circuit QED. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2016, 94 (1), ⟨10.1103/PhysRevB.94.014506⟩. ⟨cea-01485238⟩

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