GROUP SEMINARS

We are happy to announce that we will have two group seminars next Tuesday. Here below all the details

Speaker: Cristoforo Travaglini
Title: Conservation of orbital angular momentum in realistic two-photon entangled states

Speaker: Iris Paparelle
Title: Implementation and security analysis of continuous variable quantum secure direct communication

When: Tuesday, 25th May 2021, 2:30PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x

Group SEMINARS

We are happy to announce that we will have two group seminars next Tuesday. Here below all the details

Speaker: Moritz Richter
Title: Classicality of quantum processes with informationally complete measurements

Speaker: Giacomo Piscia
Title: Multi-parameter quantum metrology with time-continuous measurements

When: Tuesday, 18th May 2021, 2:30PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x

group seminars

We are happy to announce that we will have two group seminars next Tuesday. Here below all the details

Speaker: Emanuele Marconato
Title: Non-classicality and hybrid quantum-classical systems

Speaker: Michele Nicola Notarnicola
Title: Phase noise mitigation by realistic optical parametric oscillators

When: Tuesday, 11th May 2021, 2:30PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x

Seminar by Alessandro Candeloro

We are happy to announce our next seminar.

Speaker: Alessandro Candeloro (University of Milan, ITA)
When: Tuesday, 4th May 2021, 2:30PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x


Title: Measurement-powered engine

Abstract:
In the quantum realm, irreversibility primarily comes from the measurement process. From a thermodynamical point of view, the latter plays a role similar to a hot source with the noticeable difference that, in this case, the fuel is not thermal but quantum. In this seminar, the concept of a measurement-fueled engine based on a single qubit will be introduced, revealing the energetic counterpart of measurement devices. Then, the measurement process will be described from a quantum perspective, considering the creation of quantum correlations between the system to measure and a quantum meter. Energy and entropy flow along this process will be studied, unveiling the microscopic origin of the measurement fuel, and proving that entanglement plays a crucial role in the fueling mechanism. These can be regarded as a new class of heat engines in which there is no thermal bath, and the only source of fuel and noise is the measurement itself.

New Visiting Scholar and Seminar

Heng-Ji Li from the School of Computer Science of the Beijing University of Posts and Telecommunications is going to join our group as a visiting scholar starting from April 2021.
Welcome on board Heng-Ji!

He is going to deliver our group seminar. See the details here below.

Speaker: Heng-Ji Li (Beijing University of Posts and Telecommunications, CHN)
When: Wednesday, 7thh Aprile 2021, 3PM (CET time)
Where: online (Zoom) zoom.us/my/aula.consiglio


Title: Accomplishing quantum information tasks with coined quantum walks

Abstract:
Quantum walks (QWs) have received much attention due to their many potential applications for quantum information processing in recent years. In our work, we take advantage of the properties of coined quantum walks to accomplish some quantum information tasks, such as quantum teleportation, quantum information splitting and quantum teleportation of shared quantum secret. To do it, different kinds of models of QWs are used, such as QWs with multiple walkers, coins and so on. This work opened wider application of QWs and provided inspiration to explore the potential applications of QWs.

Seminar by Abolfazl Bayat


We are happy to announce our next seminar.

Speaker: Abolfazl Bayat (University of Electronic Science and Technology of China, CHN)
When: Thursday, 14th January 2020, 3PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x


Title: Driving enhanced quantum sensing in partially accessible many-body systems

Abstract:
Ground state criticality of many-body systems is a resource for quantum enhanced sensing, namely Heisenberg precision limit, provided that one has access to the whole system. We show that for partial accessibility the sensing capacity of a block in the ground state reduces to sub-Heisenberg limit. To compensate for this, we drive the system periodically and use the local steady state for quantum sensing. Remarkably, the steady state sensing shows a significant enhancement in its precision in comparison with the ground state and even shows super-Heisenberg scaling for a certain range of frequencies. The origin of this precision enhancement is found to be the closing of the Floquet gap. This is in close correspondence with the role of the vanishing energy gap
at criticality for quantum enhanced ground state sensing with global accessibility.

SEMINAR BY Jan Chwedenczuk

We are happy to announce our next seminar.

Speaker: Jan Chwedenczuk (Warsaw University, POL)
When: Thursday, 7th January 2020, 3PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x


Title: Many-body nonlocality as a resource for quantum-enhanced
metrology


Abstract:
In this talk I will argue that the strongest quantum correlation, manifested by a many-body nonlocality, is a resource for ultra-precise metrology. I will show that the sensitivity of a quantum sensor can be expressed in terms of many-body correlation functions (such that witness the nonlocality) of all orders. I will illustrate this general result with some prominent examples, such as a collection of spins forming an Ising chain or a gas of ultra-cold bosons in any two-mode configuration.


We are also glad to announce one more seminar
[ more details in the next weeks — SAVE THE DATE(S) ]

Speaker: Abolfazl Bayat (University of Electronic Science and Technology of China Chengdu, CHN)
When: Thursday, 14th January 2020, 3PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x
Title: TBA

Seminar by Luca Razzoli

We are happy to announce our next seminar.

Speaker: Luca Razzoli (University of Modena & Reggio Emilia, ITA)
When: Thursday, 17th December 2020, 3PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x


Title: Transport efficiency of continuous-time quantum walks on graphs

Abstract:
Continuous-time quantum walk describes the propagation of a quantum particle (or an excitation) evolving continuously in time on a graph. As such, it provides a natural framework for modeling transport processes, e.g., in light-harvesting systems. In particular, the transport properties strongly depend on the initial state and on the specific features of the graph under investigation. In this talk, we are going to address the role of graph topology, and investigate the transport properties of graphs with different regularity, symmetry, and connectivity. We neglect disorder and decoherence, and assume a single trap vertex accountable for the loss processes. In particular, for each graph, we analytically determine the subspace of states having maximum transport efficiency. Our results provide a set of
benchmarks for environment-assisted quantum transport, and suggest that connectivity is a poor indicator for transport efficiency. Indeed, we observe some specific correlations between transport efficiency and connectivity for certain graphs, but in general they are uncorrelated.


We are also glad to announce two more seminars
[ more details in the next weeks — SAVE THE DATE(S) ]

Speaker: Jan Chwedenczuk (Warsaw University, POL)
When: Thursday, 7th January 2020, 3PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x
Title: Many-body nonlocality as a resource for quantum-enhanced
metrology

Speaker: Abolfazl Bayat (University of Electronic Science and Technology of China Chengdu, CHN)
When: Thursday, 14th January 2020, 3PM (CET time)
Where: online (Zoom) zoom.us/my/aula.x
Title: TBA

Quantum Technology Lab – Dipartimento di Fisica – Università degli Studi di Milano