研究目的
Investigating the dispersive readout of a qubit using a single-photon probe to avoid errors due to nonorthogonality of coherent states and to improve readout contrast.
研究成果
The study demonstrates that a single-photon probe can achieve high readout contrast (over 75%) for an ideal detector and single-photon source within a readout time of 1 μs. The Bloch-Siegert shift is shown to improve readout performance. The theory provides a foundation for understanding photon transport through the qubit-resonator system beyond the rotating-wave approximation.
研究不足
The study is limited by the assumption of a single-photon probe and the need to treat counter-rotating terms perturbatively. The readout contrast is also affected by qubit relaxation and the finite integration time of the photodetector.
1：Experimental Design and Method Selection:
The study uses the Heisenberg-Langevin equations to model the system dynamics, treating counter-rotating terms in the Hamiltonian perturbatively to account for the Bloch-Siegert shift.
2：Sample Selection and Data Sources:
The system consists of a qubit weakly coupled to a resonator, probed by a single-photon pulse. The output is measured using a photodetector.
3：List of Experimental Equipment and Materials:
The setup includes a resonator, a qubit, a single-photon source, and a photodetector. The Hamiltonian includes terms for the qubit, resonator, their interaction, and coupling to waveguides.
4：Experimental Procedures and Operational Workflow:
A single-photon pulse is incident on the resonator, and the transmitted photons are detected. The system's response is analyzed to determine the qubit state.
5：Data Analysis Methods:
Two approaches are used: one neglecting qubit relaxation for a compact contrast expression, and another accounting for relaxation to further improve contrast.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
