Ultra-Low Noise Balanced Receiver with &gt;20 dB Quantum-to-Classical Noise Clearance at 1 GHz

Milovančev, Dinka; Honz, Florian; Vokić, Nemanja; Laudenbach, Fabian; Hübel, Hannes; Schrenk, Bernhard

doi:10.1109/ecoc52684.2021.9606023

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…A die-level balanced homodyne receiver with a 40 dB CMRR up to 1 GHz is presented for coherent optical access and continuous-variable quantum applications. 80 A 3 GHz bandwidth die-level balanced homodyne detector with a significant quantum-to-classical noise removal of 19.1 dB was obtained. 81 A customized integrated TIA constructed in a 100 nm GaAs pHEMT technology was utilized in this co-integrated balanced homodyne detector.…”

Section: Homodyne Detectormentioning

confidence: 95%

Silicon photonics interfaced with microelectronics for integrated photonic quantum technologies: a new era in advanced quantum computers and quantum communications?

et al. 2023

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Section: Homodyne Detectormentioning

confidence: 95%

Silicon photonics interfaced with microelectronics for integrated photonic quantum technologies: a new era in advanced quantum computers and quantum communications?

et al. 2023

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“…The virtualization of the computationally expensive post-processing tasks could be convenient in the future. Not all optical network units (ONUs) have access to QKD functionality, but the same hardware may be used for coherent passive optical networks (PONs) and CV-QKD [41,42].…”

Section: Use Casesmentioning

confidence: 99%

On the Security of Offloading Post-Processing for Quantum Key Distribution

Lorünser

Krenn

Pacher

et al. 2023

Entropy

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Quantum key distribution (QKD) has been researched for almost four decades and is currently making its way to commercial applications. However, deployment of the technology at scale is challenging because of the very particular nature of QKD and its physical limitations. Among other issues, QKD is computationally intensive in the post-processing phase, and devices are therefore complex and power hungry, which leads to problems in certain application scenarios. In this work, we study the possibility to offload computationally intensive parts in the QKD post-processing stack in a secure way to untrusted hardware. We show how error correction can be securely offloaded for discrete-variable QKD to a single untrusted server and that the same method cannot be used for long-distance continuous-variable QKD. Furthermore, we analyze possibilities for multi-server protocols to be used for error correction and privacy amplification. Even in cases where it is not possible to offload to an external server, being able to delegate computation to untrusted hardware components on the device itself could improve the cost and certification effort for device manufacturers.

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“…Instead of a dedicated custom PIC and custom electrical integrated circuit (IC) designs, we are exploring the potential of existing commercially available chip-level components for both photonic as well as electronic elements, thus minimizing the parasitics and achieving low-noise operation. This paper is the extension of our initial works [15,16] and covers the performance characterization of different designs of die-level photodiode / transimpedance amplifier (TIA) assemblies in search for optimum design trade-offs for BHDs in view of quantum applications.…”

Section: Chip-level Ghzmentioning

confidence: 99%

Chip-Level GHz Capable Balanced Quantum Homodyne Receivers

Milovančev

Honz

Vokić

et al. 2022

J. Lightwave Technol.

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We present a design of balanced homodyne receivers suitable for ultra-low noise quantum applications such as continuous-variable quantum key distribution and quantum random number generation. For best noise and bandwidth performance a die-level low-parasitic photodiode together with a low-noise high-speed transimpedance amplifier are explored together with a planar lightwave circuit splitter chip serving as a photomixer. Bandwidths of 750 MHz and 2.6 GHz were accomplished while maintaining optimum noise performance, as evidenced by very high quantum-to-classical noise ratios of 26.8 and 18.6 dB, respectively. A common-mode rejection ratio of at least 40 dB was achieved for a frequency range of up to 1 GHz. Its application for continuous-variable quantum key distribution was evaluated by means of estimations under a strict untrusted receiver assumption, showing its potential for generating up to 43 Mbit/s secure-key rate over a reach of 10 km, whereas up to 100 Mbit/s could be supported at shorter reaches. Moreover, the high quantum-to-classical clearance values can enable high quality quantum random number generation at Gb/s rates. The multipurpose operation of the designed balanced receivers for classical communications was examined showing reception sensitivities of -55.8 and -52.6 dBm at 500 Mbit/s and 1 Gbit/s quadrature phase shift keying transmission, respectively, using the 750 MHz receiver. The faster 2.6 GHz receiver enabled 10 Gbit/s duobinary transmission at -14.8 dBm sensitivity.

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Ultra-Low Noise Balanced Receiver with >20 dB Quantum-to-Classical Noise Clearance at 1 GHz

Cited by 3 publications

References 9 publications

Silicon photonics interfaced with microelectronics for integrated photonic quantum technologies: a new era in advanced quantum computers and quantum communications?

Silicon photonics interfaced with microelectronics for integrated photonic quantum technologies: a new era in advanced quantum computers and quantum communications?

On the Security of Offloading Post-Processing for Quantum Key Distribution

Chip-Level GHz Capable Balanced Quantum Homodyne Receivers

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