in the transmon device, T₁ is further improved up to 0.3 ms. These results demonstrate that previous T₁ times were not limited by Josephson junction losses. Understanding the fundamental limits on the coherence time in superconducting qubits such as the transmon is an active area of research.

Comparison to Cooper-pair box

The transmon design is similar to the first design of the charge qubit known as a "Cooper-pair

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