Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.010501
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Funding
- Assistant Secretary of Defense for Research and Engineering under Air Force [FA8721-05-C-0002]
- U.S. Army Research Office [W911NF-14-1-0078]
- National Science Foundation [PHY-1415514]
- UK Engineering and Physical Sciences Research Council
- Direct For Mathematical & Physical Scien
- Division Of Physics [1415514] Funding Source: National Science Foundation
- Engineering and Physical Sciences Research Council [EP/J001821/1] Funding Source: researchfish
- EPSRC [EP/J001821/1] Funding Source: UKRI
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We present measurements of coherence and successive decay dynamics of higher energy levels of a superconducting transmon qubit. By applying consecutive pi pulses for each sequential transition frequency, we excite the qubit from the ground state up to its fourth excited level and characterize the decay and coherence of each state. We find the decay to proceed mainly sequentially, with relaxation times in excess of 20 mu s for all transitions. We also provide a direct measurement of the charge dispersion of these levels by analyzing beating patterns in Ramsey fringes. The results demonstrate the feasibility of using higher levels in transmon qubits for encoding quantum information.
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