Abstract
The realization of large-scale photonic circuit for quantum optics experiments at telecom wavelengths requires an increasing number of integrated detectors. Superconductive nanowire single photon detectors (SNSPDs) can be easily integrated on chip and they can efficiently detect the light propagating inside waveguides. The thermal budget of cryostats poses a limit on the maximum number of elements that can be integrated on the same chip due to the thermal impact of the readout electronics. In this paper, we propose and implement a novel scheme able for an efficient reading of several SNSPDs with only one readout port, enabling the realization of photonic circuits with a large number of modes.
Highlights
Single photons are promising candidates as quantum bits for quantum information applications due to their low decoherence and ease of transmission, both in free space and by means of optical fibers
The scalability of our approach depends on three main parameters: the input resistance of the readout electronics Rout, the maximum resistance value RM allowed by the system, and the signal-to-noise ratio (SNR)
We demonstrated an easy-to-use and scalable architecture for the readout of multiple superconducting detectors integrated in a high-dimensional photonic integrated circuits (PICs)
Summary
Single photons are promising candidates as quantum bits (qubits) for quantum information applications due to their low decoherence and ease of transmission, both in free space and by means of optical fibers. The use of dedicated readout electronics for each detector channel is not a practical solution and has a tremendous impact on the thermal budget allowed by cryostats. To overcome these limitations, several multiplexing schemes have been proposed based on different approaches. Prior art for relevant multiplexing applications, thanks to the capability to discriminate the position where the photon is absorbed. This property is of paramount importance in quantum integrated photonics. Combining our approach with the use of a cryogenic amplifier, tens of detectors can be read with a single coaxial cable with a minimum thermal impact on the operating temperature
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