University of Waterloo

200 University Avenue West

Waterloo, Ontario, Canada N2L 3G1

Phone: (519) 888-4567 ext 32215

Fax: (519) 746-8115

Assistant Professor

Simulating interacting quantum many-body systems on a conventional computer is hard, and often practically impossible. Because, the laws of quantum mechanics are not inbuilt in the workings of a (classical) computer. Dr. Rajibul Islam and his research group are using experimental "quantum simulators" to extract information from such interacting quantum systems. They build a quantum system atom-by-atom, by laser-cooling and trapping atomic ions, and engineer flexible quantum Hamiltonians to address problems in quantum many-body physics and computation.

**Contact information**

Office: QNC 4109

Phone: 519 888-4567 ext. 31995

Email: krislam@uwaterloo.ca

Website: Quantum Information with Trapped Ions

- Experimental quantum many-body physics with ultra-cold atomic ions
- Quantum Computing
- Entanglement in strongly correlated matter, experimental schemes to measure entanglement
- Frustrated spin systems, and their experimental realization with synthetic cold matter
- Fully connected spin networks using trapped ions

Many outstanding problems of modern physics involve understanding the origin and properties of strongly interacting quantum systems. Such correlated quantum systems – such as the high-Tc superconductors and quark-gluon plasma in a particle collider – are present in various energy scales. In an interacting quantum system, entanglement or non-classical correlations between parts often makes theoretical or numerical analysis intractable. An experimental way to solve this problem is to simulate quantum models using well-controlled quantum systems in the laboratory. In these experimental ‘quantum simulators’, it is possible to add complexities and increase the system size in a controlled way. The long quantum coherence in these systems allow their temporal evolution following the quantum laws of nature. The task of the experimentalist is then to initialize the system in a known state, engineer the desired quantum Hamiltonian, let the system evolve in isolation from its environment, and finally measure the outcome. The knowledge gained from studying non-trivial quantum models can potentially lead to the understanding of exotic quantum phases of matter, and give fundamental insights towards realizing quantum computers.

The main research focus of the QITI laboratory is to use laser-cooled trapped ions to simulate non-trivial quantum Hamiltonians. The long range Coulomb interaction between the ions would be exploited to engineer versatile spin Hamiltonians. The spin interactions can be tuned, in principle arbitrarily, and the individual spins can be detected with near perfection. Multi-spin interactions can be created, allowing us to study interacting (spinless) Fermions. Further, the phonons associated with the collective vibrational modes enable us to study interacting bosonic Hamiltonians, such as the Bose-Hubbard model. While trapped ions normally have long quantum coherence, one can introduce dissipation in a controlled way for studying open quantum systems. Interacting Hamiltonians and open quantum systems are often hard to simulate on classical computers, and may become intractable beyond 30-40 spins. The QITI laboratory aims to work in the regime where classical computation is difficult or intractable.

*Measuring entanglement entropy in a quantum many-body system*

Rajibul Islam, Ruichao Ma, Philipp M. Preiss, M. Eric Tai, Alexander Lukin, Matthew Rispoli, and Markus Greiner.**Nature 528, 77 (2015)**,**Nature News and Views***Strongly Correlated Quantum Walks in Optical Lattices*

Philipp M. Preiss, Ruichao Ma, M. Eric Tai, Alexander Lukin, Matthew Rispoli, Philip Zupancic, Yoav Lahini,*Rajibul Islam*, and Markus Greiner**Science 347, 6225 (2015)**,**Science Perspective**,**arXiv:1409.3100***Emergence and Frustration of Magnetic Order with Variable-Range Interactions in a Trapped Ion Quantum Simulator*, C. Senko, W. C. Campbell, S. Korenblit, J. Smith, A. Lee, E. E. Edwards, C.-C. J. Wang, J. K. Freericks, and C. Monroe,

R. Islam**Science 340, 583 (2013)**,**arXiv1210.0142***Onset of a Quantum Phase Transition with a Trapped Ion Quantum Simulator**R. Islam*, E. E. Edwards, K. Kim, S. Korenblit, C. Noh, H. Carmichael, G.-D.Lin, L.-M. Duan, C.-C. Wang, J. K. Freericks and C. Monroe**Nature Communications 2:377 (2011)****arXiv:1103.2400**,**JQI press release***Quantum simulation of frustrated Ising spins with trapped ions*

K. Kim, M.-S. Chang, S. Korenblit,*R. Islam*, E. E. Edwards, J. K. Freericks, G.-D. Lin, L.-M. Duan, and C. Monroe

**Nature****465, 590 (2010)**,**Nature News and Views**,**JQI press release***Entanglement and Tunable Spin-Spin Couplings Between Trapped Ions Using Multiple Transverse Modes*

K. Kim, M.-S. Chang,*R. Islam*, S. Korenblit, L.-M. Duan, and C. Monroe**Phys****. Rev. Lett. 103, 120502 (2009)**

Please see Google Scholar for a complete list of Dr. Islam's publications.

- 2013: Distinguished Dissertation Award, University of Maryland
- 2011: Best paper award, DARPA Optical Lattice Emulator project
- 2007: Honorable Mention - Ralph D. Myers Teaching Assistant Award For Excellence in Teaching, University of Maryland

- Faculty, Institute for Quantum Computing

2012 Ph.D. in Physics, University of Maryland, College Park

2007 M.Sc. in Physics, Tata Institute of Fundamental Research, Mumbai

2005 B.Sc. in Physics, Jadavpur University, Kolkata

Affiliation:

University of Waterloo

University of Waterloo

200 University Avenue West

Waterloo, Ontario, Canada N2L 3G1

Phone: (519) 888-4567 ext 32215

Fax: (519) 746-8115

University of Waterloo

University of Waterloo

43.471468

-80.544205

200 University Avenue West

Waterloo,
ON,
Canada
N2L 3G1