Qubit Zoo

Methods to achieve near-millisecond energy relaxation and dephasing times for a superconducting transmon qubit

1 min read

Abstract Superconducting qubits are one of the most promising physical systems for implementing quantum computers.

Key Results

  • However, executing quantum algorithms of practical computational advantage requires further improvements in the fidelities of qubit operations, which are currently limited by the energy relaxation and dephasing times of the qubits.

  • Here, we report our measurement results of a high-coherence transmon qubit with energy relaxation and echo dephasing times surpassing those in the existing literature.

  • We measure a qubit frequency of 2.9 GHz, an energy relaxation time T 1 with a median of 425 μs and a maximum of (666 ± 33)μs, and an echo dephasing time

              $${T}_{2}^{{{{\rm{echo}}}}}$$
          
            
              
                T
              
              
                2
              
              
                echo
              
            
          
        
       with a median of 541 μs and a maximum of (1057 ± 138)μs.

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