| Autor: |
Touzard S; Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA., Kou A; Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA., Frattini NE; Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA., Sivak VV; Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA., Puri S; Yale Quantum Institute, Yale University, New Haven, Connecticut 06520, USA., Grimm A; Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA., Frunzio L; Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA., Shankar S; Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA., Devoret MH; Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA. |
| Abstrakt: |
We have realized a new interaction between superconducting qubits and a readout cavity that results in the displacement of a coherent state in the cavity, conditioned on the state of the qubit. This conditional state, when it reaches the cavity-following, phase-sensitive amplifier, matches its measured observable, namely, the in phase quadrature. In a setup where several qubits are coupled to the same readout resonator, we show it is possible to measure the state of a target qubit with minimal dephasing of the other qubits. Our results suggest novel directions for faster readout of superconducting qubits and implementations of bosonic quantum error-correcting codes. |
