Josephson Array-Mode Parametric Amplifier

Abstract

We introduce a novel near-quantum-limited amplifier with a large tunable bandwidth and high dynamic range -the Josephson Array Mode Parametric Amplifier (JAMPA). The signal and idler modes involved in the amplification process are realized by the array modes of a chain of 1000 flux tunable, Josephson-junction-based, nonlinear elements. The frequency spacing between array modes is comparable to the flux tunability of the modes, ensuring that any desired frequency can be occupied by a resonant mode, which can further be pumped to produce high gain. We experimentally demonstrate that the device can be operated as a nearly quantum-limited parametric amplifier with 20 dB of gain at almost any frequency within (4−12) GHz band. On average, it has a 3 dB bandwidth of 11 MHz and input 1 dB compression power of −108 dBm, which can go as high as −93 dBm. We envision the application of such a device to the time-and frequency-multiplexed readout of multiple qubits, as well as to the generation of continuous-variable cluster states.

Optimizing Josephson-ring-modulator-based Josephson parametric amplifiers via full Hamiltonian control

“…Yet how do we tame these limitations to optimize the device by maximizing P ±1dB ? Our analysis and results are generally applicable for all amplifiers based on third-order couplings, including JPAs based on Superconducting Nonlinear Asymmetric Inductive eLements (SNAILs) [25,[29][30][31]), flux pumped Superconducting QUantum Interference Devices (SQUIDs) [7,[32][33][34][35], and the Josephson Parametric Converters (JPCs) [8,9,21,24,36]). These techniques we develop may also be of use in simulation of non-cavity based amplifiers, such as the traveling wave parametric amplifier (TWPA) [37][38][39].…”

Experimental quantum teleportation of propagating microwaves

“…In principle, to make our QT protocol completely secure against potential eavesdropping of the feedforward signal, we would have to extend the power range of teleported states to n d ≫ 1 while preserving F > F nc ( 23 ). This goal can be achieved in the future by improving the 1-dB compression point of our JPAs, P 1−dB ≃ −130 dBm, to higher values ( 24 ). A weak dependence of the QT fidelity F on the coherent state phase θ d , observable for n d ≫ 1 in Fig.…”

Broadband Squeezed Microwaves and Amplification with a Josephson Traveling-Wave Parametric Amplifier

“…For example, the impedance engineering of resonator-based JPAs has increased the bandwidth to the 0.5-0.8 GHz range [35,36], but these devices still have a dynamic range limited to -110 to -100 dBm and sub-gigahertz bandwidth. An alternative approach using superconducting nonlinear asymmetric inductive elements (SNAILs) for both resonant [37][38][39] and traveling wave [40,41] parametric amplification feature an improved dynamic range in the -100 to -90 dBm range, but the resonant version remains narrowband, both architectures require a magnetic field bias, and both have thus far been limited to 2-3 dB single-mode and two-mode squeezing. High kinetic inductance wiring has been used in place of Josephson junctions to realize the nonlinearity needed for both resonant [42] and traveling wave parametric amplification [43,44] with higher dynamic range.…”