CQT Colloquium by Barry C. Sanders, University of Calgary

Title: PT Symmetry as a Time-Dependent Inner Product on Hilbert Space
Date/Time: 20-Aug, 11:00AM
Venue: Online via Zoom

Abstract: We show that PT Symmetry is explained within our framework of time-dependent Hilbert-space inner product, which we show is equivalent to quantum-channel evolution. Despite unobservability of inner product, we show that a changing inner product is discernible and include a qubit example, which we show is simulatable by unitary evolution of a qutrit. Furthermore, we prove that this changing inner product confers no advantage for quantum computing


Please register to receive zoom details: http://bit.ly/cqtwebinar    

CQT Online Talk by Chithrabhanu Perumangatt, CQT, NUS

Title: Linear and compact entangled photon source designs for quantum communication
Date/Time: 20-Aug, 04:00PM
Venue: Online Event

Abstract: As the field of quantum communication is getting matured enough to be applied for real-life solutions, peruse for high performing,compact and field deployable quantum sources have greater importance. One of the main focus of our group is to enable satellite based quantum networks, for which we have been developing different entangled photon sources that are stable and compact enough to be deployed in such environments.

In this talk, I will be describing three different sources which are developed from our group and their prospects for different applications.

 Please register to receive zoom details: http://bit.ly/cqtwebinar  

CQT-SGInnovate Event

Title: Towards a Quantum Internet
Date/Time: 28-Aug, 11:00AM
Venue: Online Event

Today's internet connects users around the world instantaneously. Would a quantum internet be able to do the same while bringing new advantages in security and computing? In this webinar, discover the state-of-the-art in quantum communication technology and the goals ahead.

In parts of the world today, Quantum Technology is already utilised to gain and improve communication security. For example, in Japan, Toshiba recently demonstrated the use of quantum key distribution to encrypt the transmission of genome data in collaboration with a medical organisation. Government and finance groups may want to use the same approach to future-proof the security of their communications. In the long run, a quantum internet may also connect the processing power of advanced quantum computers. However, the challenge lies in going global.

Quantum signals can be sent through fibre, much like today's internet signals that travel as light through optical fibres. However, the restrictions lie in the distance due to optical losses. Like today's internet signals that travel as light through optical fibres, quantum signals can be sent through fibre, but they are restricted in the distance capability due to optical losses. Not to be deterred, scientists and engineers are innovating and considering satellite links as a means of connection. China's Micius satellite and Singapore's SpooQy-1 nanosatellite are already testing such quantum technology in space.

Join us as our panel of experts brings you up to date with recent results from projects on the ground and in space, and the progress in making the technology more widely available.

Presented by SGInnovate and Centre for Quantum Technologies

Programme:

11:00am – 11:10am: Introduction to Quantum Communications by Alexander Ling, Principal Investigator, Centre for Quantum Technologies and Associate Professor, National University of Singapore
11:10am – 11:20am: Presentation on Commercial Perspectives by Katsuro Ejima, QKD Business Development Manager, New Business Development Office, Toshiba Corporation
11:20-am – 11:45am: Panel Discussion on Towards a Quantum Internet with

* Alexander Ling, Principal Investigator, Centre for Quantum Technologies and Associate Professor, National University of Singapore
* Katsuro Ejima, QKD Business Development Manager, New Business Development Office, Toshiba Corporation
* Lum Chune Yang, CEO, SpeQtral and Industry Relations Advisor, Centre for Quantum Technologies
* Moderator: Jenny Hogan, Outreach & Media Relations, Associate Director, Centre for Quantum Technologies

11:45am – 12:00pm: Q&A

More details and registration: https://sginnovate.com/events/towards-quantum-internet-online-event

CQT Webinars Series on Quantum Computation and Quantum Simulation

Title: Entanglement Hamiltonian Tomography in Quantum Simulation 
Date/Time: 21-Aug, 03:00PM
Venue: Online via zoom

Abstract:
The experimental quantification of entanglement properties, and the entanglement spectrum in particular, play a major role in our understanding modern quantum many body physics in the lab. In this talk I will discuss a measurement scheme of the entanglement spectrum, based on an efficient parametrization of the reduced density matrix in terms of entanglement Hamiltonian. For ground states, such a parametrization is suggested by the Bisognano-Wichmann theorem of axiomatic field theory, while for quench-dynamics an ansatz is provided by conformal field theory. I will discuss numerical investigations of entanglement Hamiltonian tomography for spin models in 1D. Finally, I will present an experimental measurement of the time evolution of the entanglement spectrum on an ion-trap quantum simulator.
 
Speaker: Christian Kokail, Institute for Quantum Optics and Quantum Information

Organizer and Host: CQT Principal Investigator Dimitris G. Angelakis

Register: http://bit.ly/cqtonlinetalks