Research & Publications

For a succinct list of my peer-reviewed work, please refer to my Google Scholar profile, or my C.V.

Postdoctoral work @ Cambridge University

Interfacing quantum optics and mesoscopic spin physics in quantum dots

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A quantum dot electron spin interacting with its nuclear spin environment (Hansom (2014) Nat. Phys. 10)

The vast and as-of-yet untapped computational power of controlled quantum systems has motivated arrays of experimental efforts towards quantum systems engineering. In recent years, solid-state environments have become better controlled as settings for quantum systems, due to a better understanding of the complex environments in which information is stored. This has opened up a number of possibilities for integrating these technologies in sensing, communication, and quantum computing applications. As part of my stay in Prof. Atatüre’s group, I plan to run proof-of-concept experiments on quantum state engineering of spins and photons with optically-active semiconductor quantum dots. Semiconductor quantum dots are a versatile platform with tremendous potential for scalable integration due to well-established semiconductor fabrication procedures in industry and academia, and due to the relative ease of integration with other components such as typical integrated circuits for electrical operations, or photonic waveguides for optical operations. They offer the current state-of-the-art for single photon generation, and serve as a testbed for various novel approaches to quantum networking. This work is foundational towards the construction of interfaces between stationary and flying quantum bits, as required for the development of a “quantum internet”, where entanglement is distributed between distant nodes.

  • Improving a solid-state qubit through an engineered mesoscopic environment
    G. Éthier-Majcher*, D. Gangloff*, R. Stockill, E. Clarke, M. Hugues, C. Le Gall, M. Atatüre
    Physical Review Letters 119, 130503 (2017). PRL | arXiv:1706.07749 | Supplement: St John’s News

PhD work @ MIT

Harnessing friction atom-by-atom with trapped ions in an optical lattice

Nanofriction with a chain of trapped ions dragged on an optical lattice (MIT News)

Friction is a rough problem. Plus, some say it’s worth 5% of the GNP (that’s almost $1 trillion)! Yet the microscopic origins of the friction force and dissipation are still poorly understood. As part of my doctoral thesis, my team and I explored the physics of atomic-scale friction using a system of trapped atoms in contact with a standing wave of light, thereby simulating real materials in contact with one another.

Single-atom quantum thermodynamics

In this work, we show that quantization fundamentally alters the character of a simple thermodynamic cycle, and propose a way to verify this with a cold trapped ion system.

  • Single-atom heat machines enabled by energy quantization
    D. Gelbwaser-Klimovsky, A. Bylinskii, D. Gangloff, R. Islam, A. Aspuru-Guzik, V. Vuletić

Trapped atomic ions, systems

The work above involved a highly controllable system of trapped atomic ions in vacuum, used by other groups as a platform for quantum information science. We developed our own version:

  • Technologies for trapped-ion quantum information systems
    A. M. Eltony, D. Gangloff, M. Shi, A. Bylinskii, V. Vuletić, I. L. Chuang
    Quantum Information Processing 15, 5351 (2016). Springer | arXiv: 1502.05739
  • One-dimensional array of ion chains coupled to an optical cavity
    M. Cetina, A. Bylinskii, L. Karpa, D. Gangloff, K. Beck, Y. Ge, M. Scholz, A. Grier, I. Chuang, V. Vuletić
    New Journal of Physics 15, 053001 (2013). NJP | arXiv: 1302.2904

Mirror, mirror, who’s the fairest of them all

In collaboration with Ike Chuang’s group, we studied and developed techniques for fixing and preventing the degradation of high quality mirrors placed under vacuum in our systems:

  • Preventing and reversing vacuum-induced optical losses in high-finesse tantalum (V) oxide mirror coatings
    D. Gangloff*, M. Shi*, T. Wu*, A. Bylinskii, B. Braverman, M. Gutierrez, R. Nichols, J. Li, K. Aichholz, M. Cetina, L. Karpa, B. Jelenković, I. Chuang, V. Vuletić
    Optics Express 23, 18014 (2015). Optics Express | arXiv: 1505.03381

Narrower is better

Useful in the context of quantum information science and metrology, narrow linewidth lasers tend to be costly. Here we developed a technique for narrowing the linewidth of a commercial laser by 2 orders of magnitude

  • Passive intrinsic-linewidth narrowing of ultraviolet extended-cavity diode laser by weak optical feedback
    P. Samutpraphoot, S. Weber, Q. Lin, D. Gangloff, A. Bylinskii, B. Braverman, A. Kawasaki, C. Raab, W. Kaenders, V. Vuletić
    Optics Express 22, 11592 (2014). Optics Express | arXiv: 1402.6379

Undergraduate research work

Quantum error correction (IQC, Waterloo, Laflamme group)

We took up an old version of the 3-qubit quantum error correcting code, and demonstrated that a modern gradient-ascent optimization algorithm could improve the error-correction fidelity.

  • Experimental quantum error correction with high fidelity
    J. Zhang, D. Gangloff, O. Moussa, R. Laflamme
    Physical Review A 84, 1–4 (2011). PRA | arXiv: 1109.4821

Synaptic information transmission (uOttawa, Longtin group)

We simulated synaptic connections between neurons with simplified models accounting for plasticity, and found that for these models the information transmission was broadband, speaking against the intuition that plasticity should act as a filter

  • Broadband coding with dynamic synapses
    B. Lindner, D. Gangloff, A. Longtin, J. E. Lewis
    The Journal of Neuroscience 29, 2076–88 (2009). Journal of Neuroscience

* denotes in equal contributions