School on Quantum Cryptography (SQC)

The QSI School on Quantum Cryptography was held in Asiago-Padova, from January 29 to February 2, 2024. The School was…
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School on Quantum Cryptography (SQC)

Quantum Communications School (QComms) 2023

The Padova Quantum Communication School (QCOMMS) 2023 is organized by the European Innovative Training Network AppQInfo, funded by the H2020…
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Quantum Communications School (QComms) 2023

Quantum Internet Hackathon 2022

This hackathon is a continuation of our previous Pan-European Hackathon in 2019 and a prequel to a series of planned…
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Quantum Internet Hackathon 2022

One DC/PhD vacancy available in QSI project

UPDATE: The position is no longer available because it has been filled. One DC/PhD vacancy is available within the QSI…
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One DC/PhD vacancy available in QSI project

Security bounds for decoy-state QKD with arbitrary photon-number statistics

The decoy-state method is a standard enhancement to quantum key distribution (QKD) protocols that has enabled countless QKD experiments with…
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Security bounds for decoy-state QKD with arbitrary photon-number statistics

Deployment-ready quantum key distribution over a classical network infrastructure in Padua

Current technological progress is driving Quantum Key Distribution towards a commercial and world widescale expansion. Its capability to deliver unconditionally…
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Deployment-ready quantum key distribution over a classical network infrastructure in Padua

Practical Semi-Device Independent Randomness Generation Based on Quantum State’s Indistinguishability

Semi-device independent (Semi-DI) quantum random number generators (QRNG) gained attention for security applications, offering an excellent trade-off between security and…
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Practical Semi-Device Independent Randomness Generation Based on Quantum State’s Indistinguishability

Resource-effective Quantum Key Distribution: a field-trial in Padua city center

Field-trials are of key importance for novel technologies seeking commercialization and wide-spread adoption. This is certainly also the case for…
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Resource-effective Quantum Key Distribution: a field-trial in Padua city center

Stable, low-error and calibration-free polarization encoder for free-space quantum communication

Polarization-encoded free-space Quantum Communication requires a quantum state source featuring fast polarization modulation, long-term stability and a low intrinsic error…
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Stable, low-error and calibration-free polarization encoder for free-space quantum communication

Simple Quantum Key Distribution with qubit-based synchronization and a self-compensating polarization encoder

Quantum Key Distribution (QKD) relies on quantum communication to allow distant parties to share a secure cryptographic key. Widespread adoption…
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Simple Quantum Key Distribution with qubit-based synchronization and a self-compensating polarization encoder

QuantumFuture

QuantumFuture Research Group focuses its objectives on the communication at the quantum limit. QuantumFuture, originally born as a strategic project of the University of Padova, has a deep expertise is in free-space quantum communication, both on ground and in Space, as well as in quantum optics and quantum key distribution.

We wish to motivate in more details why we focus our research on free-space communication, which, at present, is relatively unexplored with respect to fiber-based optical communication, but, at the same time, it is attracting an increasing interest. Two reasons can be given for this choice:

  • At a fundamental level, it is a powerful tool to confirm the validity of quantum mechanics over truly large distances (also over interplanetary distances).
  • At the practical level, by its intrinsic flexibility with respect to different applications’ context, as explained below.

Achieving the quantum limit in real-world free-space communications, in order to realize a decisive leap forward in the communication capacity, implies great difficulties in several areas, whose solutions are targeted in our objectives. Two examples of such difficulties are expounded here:

  • On a fundamental physical side, any real quantum communication system, by interacting with its environment, is subject to a loss of quantum coherence. The understanding of such effects in the practical implementation of quantum channels is crucial for the optimization of the channel itself. Indeed, the design of the communication systems has to adopt an encoding scheme and an error-correcting protocol tailored to the particular channel.
  • On a practical side, one has to exploit recent technologies for quantum detection and system integration. One of such field where research is very active is that of detectors for single photon counting, going on worldwide in several laboratories. Several characteristics must be carefully ascertained before a practical application of a given device: spectral response, time tagging capability, dark counts level, after-pulsing probability, and last but not least availability, reliability and cost. Our past and present experiences (see our publication) show our competence to approach such problems.

QuantumFuture is focused on the communication at the quantum limit. This subject is the physical terminus of several practical situations as:

  • the very-long range communications, due to the strong signal attenuation, which reach the single photon level;
  • the very high bit-rate links, due to the limitation in the input power to stay below nonlinear threshold,
  • the coding of information based on the single quanta internal degrees of freedom, as in quantum cryptography or teleportation.

It is important to emphasize that within each of these contexts, the project can take advantage of the competences of the three operating units (optics, telecommunications and controls), as all share the scientific background and use common implementing techniques. We are devoting our efforts to explore the following topics:

  1. Modeling of the atmospheric channel
  2. Adaptive Optics Elements
  3. Telescopes Definition
  4. Frequency and Time Synchronization
  5. Optical Communication improvement
  6. Quantum Key Distribution enhancement