Josephson directional amplifier for quantum measurement of superconducting circuits

Abstract

We have realized a microwave quantum-limited amplifier that is directional and can therefore function without the front circulator needed in many quantum measurements. The amplification takes place in only one direction between the input and output ports. Directionality is achieved by multi-pump parametric amplification combined with wave interference. We have verified the device noise performances by using it to readout a superconducting qubit and observed quantum jumps. With an improved version of this device, qubit and preamplifer could be integrated on the same chip.

References in corpus (9)

• Amplification and squeezing of quantum noise with a tunable Josephson metamaterial
• Quantum feedback control of a superconducting qubit: Persistent Rabi oscillations
• Observation of quantum jumps in a superconducting artificial atom
• Quantum back-action of variable-strength measurement
• Demonstrating a Driven Reset Protocol of a Superconducting Qubit
• Initialization by measurement of a two-qubit superconducting circuit
• Widely tunable, non-degenerate three-wave mixing microwave device operating near the quantum limit
• Non-degenerate, three-wave mixing with the Josephson ring modulator
• Input Impedance and Gain of a Gigahertz Amplifier Using a DC SQUID in a Quarter Wave Resonator

Cited by in corpus (68)

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• Nonreciprocity in microwave optomechanical circuits
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