LESSO: Laser etero-integrato a stato solido per trappole ottiche

Atomic clocks are sophisticate instruments used for extremely precise measurements of time.  While a high quality wristwatch measures the time with an accuracy of about 5 seconds per year ultraprecise atomic clocks (strontium clock NIST 2015) measure the time with an accuracy of 1 second in 15 billions of years. In modern measurement systems used in metrology, measuring the time with high accuracy, allows also to measure the position with accuracy. For these reason atomic clocks find application as reference  in navigation and position systems like GPS.

One of the critical components of an optical atomic clock are high performance lasers. The emitted light of such lasers has to be “ultra-pure” in colour and extremely stable over time. In the core of the atomic clock the emission of these lasers is then used to analyse and to manipulate atomic transitions of single isolated cold atoms – in our specific case the atom strontium.

Today a relatively compact optical atomic clock has a volume of about 2 m3. Especially for space missions much more compact optical atom clock will represent an enormous advantage.  The project consortium - formed by the Bruno Kessler Foundation, the Department of Physics of the University of Pisa, the Physics Department of the University of Trento and Atomsensor SRL - aims on the radical miniaturisation of one of the components of the atomic clock, namely the laser source used to manipulate the strontium atoms. The key to the miniaturisation is the integration of laser-crystals, grown by the Physics Department of Pisa, with tiny optical circuits realised with silicon microfabrication technology (the same technology allowed the radical miniaturisation of components nowadays used in computers, smartphones, and consumer electronics etc.). The core of the laser will have a volume of some tens of cubic centimetres and its performance will be tested at the atomic clock of Atomsensor SRL in Florence, Italy.

PELM: Photonic Extreme Learning Machine: from neuromorphic computing to universal optical interpolant, strain gauge sensor and cancer morphodynamic monitor.

The PELM project aims at demonstrating machine learning photonic devices. Within a single neuromorphic computing architecture, different platforms are specialized to given tasks by their specific characteristics. Starting from a common theoretical algorithm where matrices of optical computational nodes constitute a neural network, innovative proof-of-concept prototypes are realized such as:

  1. Silicon integrated sequence of optical micro-ring resonators for photonic neuromorphic computing;
  2. Semiconductor nanowire metasurfaces for arbitrary optical function synthesis suitable for flat lenses in computer tablet or smartphone applications;
  3. Liquid polymeric droplet whispering gallery mode resonator for sensitive strain gauge sensing;
  4. Biological spherical resonators for cancer detection and morphodynamics monitoring.

The unique combination of skilled physicists, engineers and biologists- from both universities and research centers- guarantees the achievement of these ambitious goals. Complementary competences in photonic integrated devices, complex systems, linear and nonlinear optical measurements, bio-physics, and semiconductor technology allow developing various platforms for the photonic extreme learning machines and their validation on killer applications.

 

QRANGE: Quantum Random Number Generators: cheaper, faster and more secure
 
 
The generation of random numbers plays a crucial role in many applications in science and impacting society, in particular for simulation and cryptography. It is of fundamental importance that the generated numbers are truly random, as any deviation may adversely effect modelling or jeopardise security. Notably, recent breaches of cryptographic protocols have exploited weaknesses in the random number generation. In this context, schemes exploiting the inherent randomness of quantum physics have been extensively investigated. Quantum random number generation (QRNG) devices are now commercially available, which arguably represents one of the most successful developments of quantum technologies so far.
QRANGE wants to push the QRNG technology further, allowing for a wide range of commercial applications of QRNG. We will build three different prototypes, which are cheaper, faster and more secure than existing devices: i) A fully integrated low-cost QRNG based on standard CMOS technology with a cost of the order of 1€ for IoT. ii) A high-speed phase-diffusion scheme based on the interference of laser pulses with random phase relationship featuring bit rates of up to 10Gb/s. iii) Inspired by device independent schemes, a self-testing QRNG, which allows for a continuous estimation of the generated entropy, with few assumptions on the devices. Moreover, we will make considerable theoretical effort for modelling the devices, designing efficient randomness extractors and studying new semi device-independent concepts. Last but not least, we will work together with the competent institutions towards a full certification scheme of QRNG devices compliant with the highest security standards. This project addresses many key points in the call and is well-aligned with the vision and objectives of the Quantum Technologies Flagship, especially in terms of taking quantum technologies from the laboratory to industry with concrete prototype applications and marketable products.
 

BACKUP: Unveiling the relationship between brain connectivity and function by integrated photonics

 

Objectives BACKUP tackles the challenges of realizing a hybrid neuromorphic intelligent network where photonic circuitry provides both the core computing power as well as the interface to biological neurons and electronic circuitry provides both the required I/O control and the platform where algorithms (i.e., deep learning networks) emulate the biological network. After realizing a massive reservoir-computing photonic network based on a complex topology and a neuron/integrated photonic circuit interface where light controls both the topological connections (synapses) and the activity of the biological neurons, BACKUP will develop:
1. dynamic memories in photonic integrated circuits (PIC) using reservoir-computing network (RCN);
2. time-series forecasting for both noisy and chaotic inputs;
3. an artificial network (software-implemented) which emulates the physical hybrid network;
4. a hybrid network where biologic and artificial networks collaborate to jointly solve computation tasks;
5. artificial memory engrams to understand the cellular base of memory and the neuronal plasticity during learning;
6. hybrid circuits controlling neuronal hyperexcitability and seizure-induced plastic changes.
All these are extremely high-risk activities with extremely groundbreaking objectives. However, strong scientific and societal motivations – the limit of standard computers and the impact of neurological disorders on the population – motivate this research.
Recent progresses in photonics, computer science, deep learning, time series analysis, optogenetics and neurophysiology support my ambitions.
 

Nonlinear dynamics of optical frequency combs (NEMO) (2017-2019)

 

Optical frequency combs (OFCs) are light sources with a spectrum containing thousands of equally spaced laser lines. OFCs have revolutionized precise optical frequency measurements by making it possible to directly link any optical frequency to a microwave clock. Nowadays they are the indispensable equipment for many other applications, ranging from synchronization of telecommunication systems to astronomical spectral calibration and biomedical or environmental spectrometry. To date, most of the comb spectroscopies rely on table-top mode-locked femtosecond laser systems. As an alternative, passive comb sources based on Kerr microresonators have shown the technological possibility to reduce the size of a comb source to that of a sensing device. The tight confinement of light within the resonator enhances the intensity-dependent nonlinear interaction, thus enabling efficient frequency conversion of pump photons to signal and idler sidebands. However, the threshold power of Kerr combs remains too high for permitting a chip-scale comb source with an integrated pump laser. In the NEMO project we develop novel breakthrough technologies that will enable chip-based OFC sources. The first technology is that of OFCs based on quadratic nonlinear materials, which permits to reduce the pump power threshold down to the microwatt level, and the simultaneous generation of combs in different spectral regions. The second technology is that of frequency combs directly generated from a quantum cascade semiconductor laser. A key requirement for all applications is that the comb should be stable and exhibit low-phase noise operation. This is challenging because both passive and active OFC sources are nonlinear devices that exhibit a highly complex, and essentially chaotic dynamics. To be able to practically utilize OFCs based on quadratic and Kerr nonlinearities, it is crucial to develop a comprehensive theoretical understanding of the nonlinear dynamics for comb generation processes, and study the existence, behavior and stability of these devices. In this project we seek to alleviate this need by developing a novel theoretical framework able to predict the behavior and stability of both passive and active OFC sources.

 

 Read more...

 

ITPAR: A cheap, light, compact source for QKD based on intraparticle entanglement in an integrated photonic circuit (2018-2021)

The aim of this project is to develop the theory, validate the principles, design the optical system and demonstrate a quantum key distribution optical link based on the innovative concept of intra-particle entanglement. An integrated source of a quantum key in a silicon chip will be fabricated and inserted into an optical fiber communications system to demonstrate the feasibility of the concept. The innovation is both on the conceptual aspect of using a single particle for quantum key distribution, on the use of an incoherent light source to generate the entangled state as well as demonstrating quantum key distribution using a single particle based intra-particle entanglement.

 

 

Q@TN - Quantum Science and Technology in Trento

IRIS logo

Mission:

  1. Aligning all Trentino actors in the field of quantum science and technology (QST) and developing a common strategy
  2. Covering most aspects of QST merging the relevant expertise of the Partner Institutions
  3. Singling out Trentino as a reference point at European level in the area of QST

Q@TN operates within the framework of the newly launched Quantum Technologies Flagship. Q@TN coordinates the scientific and technological research and the high education in QST in Trentino, increasing the impact of the activity already carried out by local researchers in strategic areas of quantum science. Q@TN aims to attract further resources from national and international funding organisations.

Read more...