Optimal operating conditions of an entangling two-transmon gate

@article{DArrigo2012OptimalOC,
  title={Optimal operating conditions of an entangling two-transmon gate},
  author={A. D'Arrigo and E. Paladino},
  journal={New Journal of Physics},
  year={2012},
  volume={14},
  pages={053035}
}
We identify the optimal operating conditions of an entangling two-qubit gate realized by capacitive coupling of two superconducting charge qubits in a transmission line resonator (the so-called ‘transmons’). We demonstrate that the sensitivity of the optimized gate to 1/f flux and critical current noise is suppressed to leading order. The procedure only requires a preliminary estimate of the 1/f noise amplitudes. No additional control or bias line beyond those used for the manipulation of… Expand
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References

SHOWING 1-10 OF 24 REFERENCES
Controlling the spontaneous emission of a superconducting transmon qubit.
TLDR
It is found that spontaneous emission rates are strongly influenced by far off-resonant modes of the cavity and can be understood within a semiclassical circuit model. Expand
Simple all-microwave entangling gate for fixed-frequency superconducting qubits.
TLDR
An all-microwave two-qubit gate on superconducting qubits which are fixed in frequency at optimal bias points and tunable via the amplitude of microwave irradiation on one qubit at the transition frequency of the other is demonstrated. Expand
Characterization of a two-transmon processor with individual single-shot qubit readout.
We report the characterization of a two-qubit processor implemented with two capacitively coupled tunable superconducting qubits of the transmon type, each qubit having its own nondestructiveExpand
Evidence for entangled states of two coupled flux qubits.
TLDR
The dependence on temperature and relative bias between the qubits allows one to determine all the parameters of the effective Hamiltonian and equilibrium density matrix, and confirms the formation of entangled eigenstates. Expand
Rabi oscillations in a large Josephson-junction qubit.
TLDR
A circuit based on a large-area current-biased Josephson junction whose two lowest energy quantum levels are used to implement a solid-state qubit is designed and operated and is the basis of a scalable quantum computer. Expand
Fast reset and suppressing spontaneous emission of a superconducting qubit
Spontaneous emission through a coupled cavity can be a significant decay channel for qubits in circuit quantum electrodynamics. We present a circuit design that effectively eliminates spontaneousExpand
Controllable coupling of superconducting flux qubits.
TLDR
It is realized controllable coupling between two three-junction flux qubits by inserting an additional coupler loop between them, containing three Josephson junctions, providing strong qubit-coupler interaction. Expand
Superconducting qubit with Purcell protection and tunable coupling.
TLDR
It is shown that in this decoherence-free subspace, the state of the qubit can still be measured by either a dispersive shift on the resonance frequency of the resonator or by a cycling-type measurement. Expand
Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture.
TLDR
A new architecture for superconducting quantum circuits employing a three-dimensional resonator that suppresses qubit decoherence while maintaining sufficient coupling to the control signal is introduced, demonstrating that Josephson junction qubits are highly coherent. Expand
Demonstrating quantum speed-up in a superconducting two-qubit processor
We operate a superconducting quantum processor consisting of two tunable transmon qubits coupled by a swapping interaction, and equipped with non destructive single-shot readout of the two qubits.Expand
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