By Cécile Grèzes
This paintings describes theoretical and experimental advances in the direction of the belief of a hybrid quantum processor during which the collective levels of freedom of an ensemble of spins in a crystal are used as a multi-qubit sign up for superconducting qubits. A reminiscence protocol made up of write, learn and reset operations is first awarded, via the demonstration of creating blocks of its implementation with NV middle spins in diamond. Qubit states are written by way of resonant absorption of a microwave photon within the spin ensemble and browse out of the reminiscence on-demand by means of employing Hahn echo refocusing concepts to the spins. The reset step is applied in among successive write-read sequences utilizing optical repumping of the spins.
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Extra info for Towards a Spin-Ensemble Quantum Memory for Superconducting Qubits: Design and Implementation of the Write, Read and Reset Steps
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Rev. Lett. 110, 250503 (2013) 22. Y. Kubo, C. Grezes, A. Dewes, T. Umeda, J. Isoya, H. Sumiya, N. Morishita, H. Abe, S. Onoda, T. Ohshima, V. Jacques, A. -F. Roch, I. Diniz, A. Auffeves, D. Vion, D. Esteve, P. Bertet, Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble. Phys. Rev. Lett. 107, 220501 (2011) 23. C. Grezes, B. Julsgaard, Y. Kubo, M. Stern, T. Umeda, J. Isoya, H. Sumiya, S. Abe, S. Onoda, T. Ohshima, V. Jacques, J. Esteve, D. Vion, D. Esteve, K. Moelmer, P.
C A LC resonator has equally spaced energy levels which prevents any individual transition from being selectively addressed. A Josephson junction (represented by the X symbol) has unequally spaced energy levels, a property that can be used to bring non-linearity to a circuit 30 2 Background where ϕ0 = /2e is the reduced superconducting flux quantum, Ic the critical-current of the junction—that is the maximum supercurrent that the junction can support—and ϕ = ϕ1 − ϕ2 and V respectively the superconducting phase difference and voltage across the junction.
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