Abstract
In this chapter, we propose to construct relatively large quantum error-correcting codes (QECCs) with the superconducting circuits architecture at the ultrastrong coupling regime. We are able to create highly entangled quantum state commonly known as cluster state by generating entanglement between any pair of qubits within a fraction of a nanosecond. We coin this process “pairwise cluster state generation”.
There is no success without failure and losses.
—John C. Maxwell
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Notes
- 1.
We remind ourselves that this is simply the Josephson phase–voltage relation.
- 2.
We choose the linear magnetic sweep for simplicity. Other tuning scheme is equally valid as long as the adiabatic theorem is satisfied.
- 3.
As one sees that the number of qubits and the number two-qubit gates needed for both the five-qubit and the Steane codes are in the similar order, one expects to see the similar result for the Steane code, Fig. 4.8b, as compared to the five-qubit one as seen in Fig. 4.8a. The main reason of the difference is that we have assumed the projective measurement error \(p_m =0.01\) for the three orange colored qubits.
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Kyaw, T.H. (2019). Quantum Error-Correcting Codes in the USC Regime. In: Towards a Scalable Quantum Computing Platform in the Ultrastrong Coupling Regime. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-030-19658-5_4
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