Generation and efficient measurement of single photons from fixed frequency superconducting qubits

Abstract

We demonstrate and evaluate an on-demand source of single itinerant microwave photons. Photons are generated using a highly coherent, fixed-frequency qubit-cavity system, and a protocol where the microwave control field is far detuned from the photon emission frequency. By using a Josephson parametric amplifier (JPA), we perform efficient single-quadrature detection of the state emerging from the cavity. We characterize the imperfections of the photon generation and detection, including detection inefficiency and state infidelity caused by measurement backaction over a range of JPA gains from 17 to 33 dB. We observe that both detection efficiency and undesirable backaction increase with JPA gain. We find that the density matrix has its maximum single photon component ${\rho }_{11}=0.36\pm 0.01$ at 29 dB JPA gain. At this gain, backaction of the JPA creates cavity photon number fluctuations that we model as a thermal distribution with an average photon number $\bar{n}=0.041\pm 0.003$.

9 pages, 6 figures

References in corpus (14)

• The Quantum Internet
• Quantum information processing with circuit quantum electrodynamics
• Amplification and squeezing of quantum noise with a tunable Josephson metamaterial
• Quantum feedback control of a superconducting qubit: Persistent Rabi oscillations
• Generating Single Microwave Photons in a Circuit
• State Transfer Between a Mechanical Oscillator and Microwave Fields in the Quantum Regime
• Observation of quantum jumps in a superconducting artificial atom
• Using Sideband Transitions for Two-Qubit Operations in Superconducting Circuits
• The reconfigurable Josephson circulator/directional amplifier
• Initialization by measurement of a two-qubit superconducting circuit
• Measuring a topological transition in an artificial spin 1/2 system
• Photon Shot Noise Dephasing in the Strong-Dispersive Limit of Circuit QED
• On-chip superconducting microwave circulator from synthetic rotation
• Signal-to-pump back-action and self-oscillation in Double-Pump Josephson Parametric Amplifier

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