Efficient protocol for qubit initialization with a tunable environment
Tuorila, J., Partanen, M., Ala-Nissila, T., & Möttönen, M. (2017). Efficient protocol for qubit initialization with a tunable environment. npj Quantum Information, 3, Article 27. https://doi.org/10.1038/s41534-017-0027-1
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npj Quantum InformationPäivämäärä
2017Tekijänoikeudet
© the Authors, 2017. This article is licensed under a Creative Commons Attribution 4.0 International License.
We propose an efficient qubit initialization protocol based on a dissipative environment that can be dynamically adjusted. Here, the
qubit is coupled to a thermal bath through a tunable harmonic oscillator. On-demand initialization is achieved by sweeping the
oscillator rapidly into resonance with the qubit. This resonant coupling with the engineered environment induces fast relaxation to
the ground state of the system, and a consecutive rapid sweep back to off resonance guarantees weak excess dissipation during
quantum computations. We solve the corresponding quantum dynamics using a Markovian master equation for the reduced
density operator of the qubit-bath system. This allows us to optimize the parameters and the initialization protocol for the qubit.
Our analytical calculations show that the ground-state occupation of our system is well protected during the fast sweeps of the
environmental coupling and, consequently, we obtain an estimate for the duration of our protocol by solving the transition rates
between the low-energy eigenstates with the Jacobian diagonalization method. Our results suggest that the current experimental
state of the art for the initialization speed of superconducting qubits at a given fidelity can be considerably improved.
...
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2056-6387Asiasanat
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