期刊
PHYSICAL REVIEW A
卷 90, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.90.022307
关键词
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资金
- Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA) through the Army Research Office [W911NF-09-1-0375, W911NF-10-1-0334]
A controlled-phase gate was demonstrated in superconducting Xmon transmon qubits with fidelity reaching 99.4%, relying on the adiabatic interaction between the |11 > and |02 > states. Here we explain the theoretical concepts behind this protocol, which achieves fast gate times with only sigma z control of the Hamiltonian, based on a theory of nonlinear mapping of state errors to a power spectral density and use of optimal window functions. With a solution given in the Fourier basis, optimization is shown to be straightforward for practical cases of an arbitrary state change and finite bandwidth of control signals. We find that errors below 10(-4) are readily achievable for realistic control wave forms.
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