CQT's Anniversary Events

Join us for a symposium commemorating eleven years of CQT

11th Annual Symposium of the Centre for Quantum Technologies (CQT), Singapore

On the occasion of CQT’s 11th anniversary, we invite you to join us for a symposium on quantum technologies with strong international and local speakers. We welcome all interested researchers and industry colleagues to the event on 24 January 2019. The one-day programme features talks and a panel discussion across a range of experimental and theoretical topics. Registration is free.

CQT was established in December 2007 as a national Research Centre of Excellence. It brings together physicists, computer scientists and engineers to do basic research on quantum physics and to build devices based on quantum phenomena.

CQT’s annual symposia provide an opportunity to discuss hot topics aligned with the Centre’s research. These research directions span atomic, molecular and optical physics, quantum information, quantum foundations and computer science. Each year’s symposium will include different themes. This year’s programme has an emphasis on quantum computing and algorithms.

SFAH Auditorium, Level 2, Shaw Foundation Alumni House
11 Kent Ridge Drive, Singapore 119244
SFAH on Google map

24 January, Thursday Preliminary program
08:30 Registration
09:00 Opening and Welcome Remarks
09:05 Andreas Wallraff, ETH Zürich
Quantum Information Processing with Superconducting Circuits
Arrow Abstract

Superconducting circuits are a prime contender for realizing universal quantum computation and solving noisy intermediate-scale quantum (NISQ) problems on fault-tolerant or non-error-corrected quantum processors, respectively. In this talk, I will present elements of an architecture which allows for fast, high-fidelity, single shot qubit read-out [1], for unconditional reset [2], and can be multiplexed [3]. Integrating multiple qubits in a single device, we evaluate performance metrics such as the single and two-qubit gate fidelity and the qubit readout fidelity. We also test the performance of the architecture in parity measurements with real-time feedback, which is a basic element of a error correcting code. To provide a potential avenue for extending monolithic chip-based architectures for quantum information processing, we employ the circuit elements of our architecture to implement a deterministic state transfer and entanglement generation protocol [1]. Our protocol is based on an all-microwave process, which entangles or transfers the state of a superconducting qubit with a time-symmetric itinerant single photon exchanged between individually packaged chips connected by a transmission line. We transfer qubit states at rates of 50 kHz, absorb photons at the receiving node with near unit probability, and achieve transfer process fidelities and on demand remote entanglement state fidelities of about 80 %. We also show that time bin encoding can be used to further improve these quantum communication metrics [5]. Sharing information coherently between physically separated chips in a network of quantum computing modules may be an essential element for realizing a viable extensible quantum information processing system.

[1] T. Walter et al., Phys. Rev. Applied 7, 054020 (2017)
[2] P. Magnard et al., Phys. Rev. Lett. 121, 060502 (2018)
[3] J. Heinsoo et al., Phys. Rev. Applied 10, 034040 (2018)
[4] P. Kurpiers et al., Nature 558, 264-267 (2018)
[5] P. Kurpiers et al., arXiv:1811.07604 (2018)

This research was performed in a collaboration between J.-C. Besse, A. Akin, S. Gasparinetti, J. Heinsoo, P. Kurpiers, P. Magnard, M. Pechal, B. Royer, Y. Salathe, S. Storz, T. Walter, A. Blais, C. Eichler, and A. Wallraff.

09:50 Ana Maria Rey, JILA - University of Colorado Boulder
Building with Crystals of Light and Quantum Matter: From clocks to computers
Arrow Abstract

Understanding the behavior of interacting electrons in solids or liquids is at the heart of modern quantum science and necessary for technological advances. However, the complexity of their interactions generally prevents us from coming up with an exact mathematical description of their behavior. Precisely engineered ultracold gases are emerging as a powerful tool for unraveling these challenging physical problems. In this talk, I will present recent developments at JILA on using alkaline-earth atoms (AEAs) --currently the basis of the most precise atomic clock in the world-- for the investigation of complex many-body phenomena and magnetism. I will discuss ideas to use AEAs dressed by laser fields to engineer analogs of spin-orbit coupled Hamiltonians, as well as new forms of matter with no yet known counterpart in nature.

10:35 Coffee/Tea Break
11:00 Goh Kuan Eng, Johnson, Institute of Materials Research and Engineering, A*STAR
Towards Spin-valley Qubits
Arrow Abstract

Quantum computers with few to tens of qubits now exist based on several technology platforms, and the assertion of quantum supremacy appears imminent based on recent reports. Nevertheless, the task of scaling up to a universal quantum computer to handle real world problems (deemed intractable for classical computers) remains a daunting challenge. Increasing the number of qubits whilst maintaining a manageable error rate is a key current pursuit. In this talk, I will introduce our recent efforts to establish the capabilities for building spin-valley qubits based on layered 2D semiconductors. The unique spin-valley coupling in such materials is expected to suppress decoherence since a spin flip requires the concomitant change of valley. In addition, their compatibility with electrostatically-gated planar qubit architectures are desirable for reducing system complexity and hence scalability. I shall present some of our recent device results leading toward this goal.

11:30 Ng Hui Khoon, Centre for Quantum Technologies & Yale-NUS
Fault-tolerant quantum computing: From theory to reality?
Arrow Abstract

The theory of fault-tolerant quantum computation has formed the basis of our confidence in the possibility of computing reliably, even with noisy quantum devices. With the recent strong interest in realising quantum computers, we need to revisit some of these fault tolerance proofs, to connect the theory with the reality of implementing useful quantum computers. I will discuss some of these issues, and the challenges one has to overcome.

12:00 Patrick Rebentrost, Centre for Quantum Technologies
Quantum computing for machine learning and finance: challenges and examples
Arrow Abstract

The talk reviews some of the challenges of using quantum computers for practical applications in the context of machine learning and finance. A quantum neural network is discussed that can encode an exponential number of neurons into only a polynomial number of quantum bits, exhibiting potential quantum speedups. In addition, a quantum algorithm is discussed for a financial problem: the Monte-Carlo pricing of financial derivatives.

12:30 Lunch
14:00 Hanhee Paik, IBM Thomas J. Watson Research Center
IBM Q Experience with Qiskit: Cloud-based superconducting quantum computer for the NISQ-era
Arrow Abstract

Since its launch in 2016, the IBM Q Experience, a cloud-based superconducting quantum processor for research and education, has been fostering the quantum computing community by attracting more than 100,000 users worldwide, producing >130 research papers on quantum information. I will discuss how IBM quantum processors can benchmark the noisy intermediate-scale quantum (NISQ)-era quantum computing systems and how you can participate in developing applications for NISQ systems using Qiskit, an open platform quantum computing software.

14:45 Michael Bremner, University of Technology Sydney
The challenge of developing post-classical applications with noisy quantum computers
Arrow Abstract

A number of the world's leading experimental quantum computing teams are racing to develop quantum processors that might have the capability to take the first steps into the quantum frontier. It is hoped that these processors can perform some form of post-classical computation of a type that cannot be performed efficiently on a digital computer but can on a quantum computer. The theoretical challenge that this poses is twofold: firstly we must identify where the quantum frontier lies, that is, the physically least expensive quantum computations that are classically unachievable; secondly we must also determine if this advantage can be maintained in realistic physical systems. In this talk I will discuss the IQP, Boson Sampling, and chaotic circuit approaches to quantum computational supremacy, how they can be generalized to other intermediate quantum computing models, and to what extent the experimental resource requirements of these problems can be reduced.

This talk is based on joint work with:
[1] M. J. Bremner, A. Montanaro, and D. J. Shepherd, "Achieving quantum supremacy with sparse and noisy commuting quantum computations", Quantum 1, 8 (2017). arXiv:1610.01808
[2] M. J. Bremner, A. Montanaro, and D. J. Shepherd "Average-case complexity versus approximate simulation of commuting quantum computations", Phys. Rev. Lett. 117, 080501 (2016). arXiv:1504.07999
[3] S. Boixo, et al, "Characterizing quantum supremacy in near-term devices", Nature Physics 4, 595 (2018). arXiv:1608.00263.
[4] A. Lund, M. J. Bremner, T. C. Ralph "Quantum sampling problems, BosonSampling and quantum supremacy", npj Quantum Information 3, Article number: 15 (2017). arXiv:1702.03061
[5] R. Mann and M. J. Bremner, "On the Complexity of Random Quantum Computations and the Jones Polynomial", arXiv:1711.00686.
[6] R. Mann and M. J. Bremner, "Approximation Algorithms for Complex-Valued Ising Models on Bounded Degree Graphs", arXiv:1806.11282

15:30 Tommaso Demarie, Entropica Labs, Singapore
Hope and Despair in a Time of Quantum Computation
Arrow Abstract

In this talk I will discuss the current business landscape in the field of quantum computing, and the rapidly growing global landscape of startups. With a demonstration of quantum advantage approaching fast, governments, venture capitalists and entrepreneurs are getting increasingly excited by quantum computation. Will the field survive the buzz, and organically mature into a widespread and financially valuable technology, or are we approaching a quantum winter?

16:00 Coffee/Tea Break
16:30 Panel Discussion
17:30 End of Symposium

We will be updating this webpage with further details as information is available. Check back or sign up for CQT's mailing lists to get updates.