# The Future is Quantum: 20 - 22 February 2023

An emerging field of physics and engineering is quantum technology, encompassing technologies that rely on the properties of quantum mechanics. Quantum computing being one example of these technologies, representing a paradigm shift for computing technology, since it can outperform much more than existing computers. On February 21 at 13:00, in the: Svedberg salen (FD5), AlbaNova, Professor Akira Furusawa from University of Tokyo, RIKEN Center for Quantum Computing will have a presentation with the title THE FUTURE IS QUANTUM - The development of Quantum Computing.

The conference will take part at IVA Conference Centre on February 20, at Albanova on February 21 and at Chalmers on February 22. Please look at the program in the enclosed document.

The Future is Quantum (788 Kb)
- the Program

#### February 21, 2023 Albanova

**Time:** 13:00

**Location:** Svedberg salen (FD5), AlbaNova

**Program:**

- Opening remarks by Fredrik Laurell, Professor, KTH /IVA and Mohamed Bourennane, Professor, Stockholm University

- Presentation by JSPS

- Optical Quantum Computers with Quantum Teleportation, Akira Furusawa, Professor University of Tokyo, RIKEN Center for Quantum Computing

**Lecturer:** Prof. Akira Furusawa, University of Tokyo, RIKEN Center for Quantum Computing

**Registration:** No registration is required for this lecture.

#### THE FUTURE IS QUANTUM

The development of Quantum Computing

We did the first experiment of unconditional quantum teleportation at Caltech in 1998[1]. Then we did various related experiments like quantum teleportation network[2], teleportation of Schrödinger’s cat state[3], and deterministic quantum teleportation of photonic qubits[4].

We invented the scheme of teleportation-based quantum computing in 2013[5]. In this scheme, we can multiplex quantum information in the time domain and we can build a large-scale optical quantum computer only with four squeezers, five beam splitters, and two optical delay lines[6].

For universal quantum computing with this scheme, we need a nonlinear measurement and we invented the efficient way[7]. We recently succeeded in the realization[8].

Our present goal is to build a super quantum computer with 100GHz clock frequency and hundred cores, which can solve any problems faster than conventional computers without efficient quantum algorithms like Shor’s algorithm. Toward this goal we started to combine our optical quantum computer with 5G technologies[9].

1. A. Furusawa et al., Science 282, 706 (1998).

2. H. Yonezawa et al., Nature 431, 430 (2004).

3. N. Lee et al., Science 332, 330 (2011).

4. S. Takeda et al., Nature 500, 315 (2013).

5. S. Yokoyama et al., Nature Photonics 7, 982 (2013).

6. W. Asavanant et al., Science 366, 375 (2019).

7. K. Miyata et al., Phys. Rev. A 93, 022301 (2016).

8. A. Sakaguchi et al., arXiv:2210.17120 [quant-ph].

9. A. Inoue et al., arXiv:2205.14061 [quant-ph].

#### More information

Japan Society for the Promotion of Science, JSPS

Professor Furusawa

Google scholar

In this theoretical project, we intend to investigate what happens when we assemble exotic topological components. More specifically, we want to investigate four types of "sculptured topological heterostructures" as briefly described below.

In this project, we mathematical methods related to quantum mechanics are used to describe symmetries of discrete structures.

This project focuses on frontiers of topological matter such as non-Abelian anyons from twists and defects in Moiré heterostructures and topological phenomena in open dissipative systems.

Semiconductor devices and non-linear processes can generate a wide spectrum of quantum states of light that can be employed in tasks of communication, simulation, and sensing. We use best tools and methods available to modern science to generate quantum light, harness its unique properties, and bring it closer to real-world application.

The Wilczek group explores several frontiers of quantum theory where new or hitherto impractical theoretical concepts are making contact with experimenters’ increasing ability to explore and control the quantum world.

The Bergholtz group explores the world of quantum and complex systems — what it is and what it could be — from the perspective of mathematics and theoretical physics.

Due to a significant technical progress and precise engineering, we are nowadays able to manipulate individual quantum systems, like single atoms, with a precision that has been unthinkable a few decades ago.

Last updated: February 17, 2023

Source: Fysikum