Claudio Barreiro - Academia.edu (original) (raw)

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Papers by Claudio Barreiro

New Journal of Physics, 2009

In this paper we present the Quantum Key Distribution (QKD) network designed and implemented by t... more In this paper we present the Quantum Key Distribution (QKD) network designed and implemented by the European project SECOQC (2004)(2005)(2006)(2007)(2008), unifying the efforts of 41 research and industrial organizations. The paper summarizes the SECOQC approach to QKD networks with a focus on the trusted repeater paradigm. It discusses the architecture and functionality of the SECOQC trusted repeater prototype, which has been put into operation in Vienna in 2008 and publicly demonstrated in the framework of a SECOQC QKD conference held from October 8 to 10, 2008. The demonstration involved One Time Pad telephone communication, a secure (AES encryption protected) video-conference with all deployed nodes and a number of rerouting experiments, highlighting basic mechanisms of the SECOQC network functionality.

Advanced Photon Counting Techniques IV, 2010

We implement an InGaAs/InP single-photon avalanche diode (SPAD) for single-photon detection with ... more We implement an InGaAs/InP single-photon avalanche diode (SPAD) for single-photon detection with the fastest gating frequency reported so far, of 2.23 GHz, which approaches the limit given by the bandwidth of the SPAD -2.5 GHz. We propose a useful way to characterize the afterpulsing distribution for rapid gating that allows for easy comparison with conventional gating regimes. We compare the performance of this rapid gating scheme with free-running detector and superconducting single-photon detector (SSPD) for the coherent one-way quantum key distribution (QKD) protocol. The rapid gating system is well suited for both high-rate and long-distance QKD applications, in which Mbps key rates can be achieved for distances less than 40 km with 50 ns deadtime and the maximum distance is limited to ∼190 km with 5 µs deadtime. These results illustrate that the afterpulsing is no longer a limiting factor for QKD.

We report the first real world implementation of a Quantum Key Distribution (QKD) system over a 4... more We report the first real world implementation of a Quantum Key Distribution (QKD) system over a 43dB-loss transmission line in the Swisscom fibre optic network. The QKD system is capable of continuous and autonomous operation and uses the coherent one-way (COW) protocol. This system brings together three key concepts for future QKD systems: a simple high-speed protocol; high performance detection; and integration, both at the component level as well for connectivity with standard fibre networks. Here, we show laboratory and field trial results for this system. The full prototype version uses InGaAs/InP avalanche photodiodes (APDs) and was laboratory tested up to 150km, with a 10-hour exchange averaging around 2kbps of real-time distilled secret bits over 100km. In the field trials, we obtained average distribution rates, during 3 hours, of 2.5bps over a 43dB-loss line of 150km, when using superconducting single photon detectors (SSPDs).

New Journal of Physics, 2009

In this paper we present the Quantum Key Distribution (QKD) network designed and implemented by t... more In this paper we present the Quantum Key Distribution (QKD) network designed and implemented by the European project SECOQC (2004)(2005)(2006)(2007)(2008), unifying the efforts of 41 research and industrial organizations. The paper summarizes the SECOQC approach to QKD networks with a focus on the trusted repeater paradigm. It discusses the architecture and functionality of the SECOQC trusted repeater prototype, which has been put into operation in Vienna in 2008 and publicly demonstrated in the framework of a SECOQC QKD conference held from October 8 to 10, 2008. The demonstration involved One Time Pad telephone communication, a secure (AES encryption protected) video-conference with all deployed nodes and a number of rerouting experiments, highlighting basic mechanisms of the SECOQC network functionality.

Applied Physics Letters, 2009

We present a practical and easy-to-implement method for high-speed near infrared single-photon de... more We present a practical and easy-to-implement method for high-speed near infrared single-photon detection based on InGaAs/InP single-photon avalanche photodiodes (SPADs), combining aspects of both sine gating and self-differencing techniques. At a gating frequency of 921 MHz and temperature of -30 • C we achieve: a detection efficiency of 9.3 %, a dark count probability of 2.8×10 −6 ns −1 , while the afterpulse probability is 1.6×10 −4 ns −1 , with a 10 ns "count-off time" setting. In principle, the maximum count rate of the SPAD can approach 100 MHz, which can significantly improve the performance for diverse applications.

Applied Optics, 2012

We present a gated silicon single photon detector based on a commercially available avalanche pho... more We present a gated silicon single photon detector based on a commercially available avalanche photodiode. Our detector achieves a photon detection efficiency of 45±5% at 808 nm with 2·10 −6 dark count per ns at -30V of excess bias and -30 • C. We compare gated and free-running detectors and show that this mode of operation has significant advantages in two representative experimental scenarios: detecting a single photon either hidden in faint continuous light or after a strong pulse. We also explore, at different temperatures and incident light intensities, the "charge persistence" effect, whereby a detector clicks some time after having been illuminated.

New Journal of Physics, 2009

In this paper we present the Quantum Key Distribution (QKD) network designed and implemented by t... more In this paper we present the Quantum Key Distribution (QKD) network designed and implemented by the European project SECOQC (2004)(2005)(2006)(2007)(2008), unifying the efforts of 41 research and industrial organizations. The paper summarizes the SECOQC approach to QKD networks with a focus on the trusted repeater paradigm. It discusses the architecture and functionality of the SECOQC trusted repeater prototype, which has been put into operation in Vienna in 2008 and publicly demonstrated in the framework of a SECOQC QKD conference held from October 8 to 10, 2008. The demonstration involved One Time Pad telephone communication, a secure (AES encryption protected) video-conference with all deployed nodes and a number of rerouting experiments, highlighting basic mechanisms of the SECOQC network functionality.

Advanced Photon Counting Techniques IV, 2010

We implement an InGaAs/InP single-photon avalanche diode (SPAD) for single-photon detection with ... more We implement an InGaAs/InP single-photon avalanche diode (SPAD) for single-photon detection with the fastest gating frequency reported so far, of 2.23 GHz, which approaches the limit given by the bandwidth of the SPAD -2.5 GHz. We propose a useful way to characterize the afterpulsing distribution for rapid gating that allows for easy comparison with conventional gating regimes. We compare the performance of this rapid gating scheme with free-running detector and superconducting single-photon detector (SSPD) for the coherent one-way quantum key distribution (QKD) protocol. The rapid gating system is well suited for both high-rate and long-distance QKD applications, in which Mbps key rates can be achieved for distances less than 40 km with 50 ns deadtime and the maximum distance is limited to ∼190 km with 5 µs deadtime. These results illustrate that the afterpulsing is no longer a limiting factor for QKD.

We report the first real world implementation of a Quantum Key Distribution (QKD) system over a 4... more We report the first real world implementation of a Quantum Key Distribution (QKD) system over a 43dB-loss transmission line in the Swisscom fibre optic network. The QKD system is capable of continuous and autonomous operation and uses the coherent one-way (COW) protocol. This system brings together three key concepts for future QKD systems: a simple high-speed protocol; high performance detection; and integration, both at the component level as well for connectivity with standard fibre networks. Here, we show laboratory and field trial results for this system. The full prototype version uses InGaAs/InP avalanche photodiodes (APDs) and was laboratory tested up to 150km, with a 10-hour exchange averaging around 2kbps of real-time distilled secret bits over 100km. In the field trials, we obtained average distribution rates, during 3 hours, of 2.5bps over a 43dB-loss line of 150km, when using superconducting single photon detectors (SSPDs).

New Journal of Physics, 2009

In this paper we present the Quantum Key Distribution (QKD) network designed and implemented by t... more In this paper we present the Quantum Key Distribution (QKD) network designed and implemented by the European project SECOQC (2004)(2005)(2006)(2007)(2008), unifying the efforts of 41 research and industrial organizations. The paper summarizes the SECOQC approach to QKD networks with a focus on the trusted repeater paradigm. It discusses the architecture and functionality of the SECOQC trusted repeater prototype, which has been put into operation in Vienna in 2008 and publicly demonstrated in the framework of a SECOQC QKD conference held from October 8 to 10, 2008. The demonstration involved One Time Pad telephone communication, a secure (AES encryption protected) video-conference with all deployed nodes and a number of rerouting experiments, highlighting basic mechanisms of the SECOQC network functionality.

Applied Physics Letters, 2009

We present a practical and easy-to-implement method for high-speed near infrared single-photon de... more We present a practical and easy-to-implement method for high-speed near infrared single-photon detection based on InGaAs/InP single-photon avalanche photodiodes (SPADs), combining aspects of both sine gating and self-differencing techniques. At a gating frequency of 921 MHz and temperature of -30 • C we achieve: a detection efficiency of 9.3 %, a dark count probability of 2.8×10 −6 ns −1 , while the afterpulse probability is 1.6×10 −4 ns −1 , with a 10 ns "count-off time" setting. In principle, the maximum count rate of the SPAD can approach 100 MHz, which can significantly improve the performance for diverse applications.

Applied Optics, 2012

We present a gated silicon single photon detector based on a commercially available avalanche pho... more We present a gated silicon single photon detector based on a commercially available avalanche photodiode. Our detector achieves a photon detection efficiency of 45±5% at 808 nm with 2·10 −6 dark count per ns at -30V of excess bias and -30 • C. We compare gated and free-running detectors and show that this mode of operation has significant advantages in two representative experimental scenarios: detecting a single photon either hidden in faint continuous light or after a strong pulse. We also explore, at different temperatures and incident light intensities, the "charge persistence" effect, whereby a detector clicks some time after having been illuminated.