University of Waterloo
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Dr. Rajibul Islam's research interests are in quantum information processing, in particular quantum simulation and computation. His research team is building a quantum simulator with laser-cooled trapped ions to simulate models of interacting quantum many-particle systems. Dr. Islam is also involved in building 'QuantumIon', a multi-user, open-access trapped-ion quantum computer at Waterloo.
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.
Dynamical Hamiltonian engineering of 2D rectangular lattices in a one-dimensional ion chain
F. Rajabi, S. Motlakunta, C. Shih, N. Kotibhaskar, Q. Quraishi, A. Ajoy, and R. Islam.
npj Quantum Inf 5, 32, (2019); arXiv:1808.06124
A complete list of Dr. Islam's publications is available on his research site.
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
The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Indigenous Initiatives Office.