on Quantum Nanoscience
The colloquium series is taking place via ZOOM until further notice.
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Upcoming Events
Zoom (Online)
Ali Yazdani
(Tentative) Title: Visualizing novel quantum states in two-dimensional materials and their stacks
Event Details
Ali Yazdani Affiliation: Princeton University Date: May 31th, 2022 Title: Visualizing novel quantum states in two-dimensional materials and their stacks TBA To participate in the talk, please, fill out the Registration Form →
Event Details
Ali Yazdani
Affiliation: Princeton University
Date: May 31th, 2022
Title: Visualizing novel quantum states in two-dimensional materials and their stacks
TBA
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Time
(Tuesday) 9:00 am - 10:00 am (KST)
Location
ZOOM Application
Offline (Center for Quantum Nanoscience)
Jeremy Levy
(Tentative) Title: Correlated Nanoelectronics and the Second Quantum Revolution
Event Details
Jeremy Levy Affiliation: University of Pittsburgh Date: Oct 19th, 2022 (Tentative) Title: Correlated Nanoelectronics and the Second Quantum Revolution TBA To participate in the talk, please, fill out the Registration Form →
Event Details
Jeremy Levy
Affiliation: University of Pittsburgh
Date: Oct 19th, 2022
(Tentative) Title: Correlated Nanoelectronics and the Second Quantum Revolution
TBA
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Time
(Wednesday) 5:00 pm - 6:00 pm (KST)
Location
Center for Quantum Nanoscience
Research Cooperation Building,52 Ewhayeodae-gil, Daehyeon-dong
Past Events
Online (Zoom)
David Awschalom
Developing quantum systems with semiconductors and molecules
Event Details
David D. Awschalom Affiliation: University of Chicago Date: Feb 16th, 2022; 10:00 - 11:00 (KST) / Feb 15th, 19:00 - 20:00 (CT) Developing quantum systems with semiconductors and molecules Our technological preference for perfection
Event Details
David D. Awschalom
Affiliation: University of Chicago
Date: Feb 16th, 2022; 10:00 – 11:00 (KST) / Feb 15th, 19:00 – 20:00 (CT)
Developing quantum systems with semiconductors and molecules
Our technological preference for perfection can only lead us so far: as traditional transistor-
based electronics rapidly approach the atomic scale, small amounts of disorder begin to
have outsized negative effects. Surprisingly, one of the most promising pathways out of this
conundrum may emerge from current efforts to embrace defects to construct quantum
devices and machines that enable new information processing and sensing technologies
based on the quantum nature of electrons and atomic nuclei. Individual defects in diamond,
silicon carbide, and other wide-gap semiconductors have attracted interest as they possess
an electronic spin state that can be employed as a solid-state quantum bit at room
temperature. These systems have a built-in optical interface in the visible and telecom
bands, retain their coherence over millisecond timescales, and can be polarized,
manipulated, and read out using a simple combination of light and microwaves. We discuss
integrating single spin qubits into wafer-scale, commercial optoelectronic devices, extending
the coherence of these spin qubits, and demonstrating the control and entanglement of a
single nuclear spin with an electron spin.
Optically addressable spin qubits can also be created, engineered, and scaled through a
purely synthetic chemical approach. Moreover, these structures offer new opportunities to
construct hybrid systems. We demonstrate the optical initialization and readout, and
coherent control, of ground-state spins in organometallic molecules. This bottom-up
approach offers avenues to create designer qubits and to deploy the diverse capabilities of
chemical synthesis for scalable quantum technologies.
To participate in the talk, please, fill the Registration Form →
Time
(Wednesday) 10:00 am - 11:00 am (KST) / (Tuesday) Feb15th, 19:00 - 20:00 (CT)
Location
ZOOM Application
Online (Zoom)
Danna Freedman
Chemically enabled atomistic design of quantum systems
Event Details
Danna Freedman Affiliation: F. G. Keyes Professor of Chemistry, Massachusetts Institute of Technology Date: Dec 16th, 2021; 10:00 - 11:00 (KST) / Dec 15th, 20:00 - 21:00 (EST) Chemically enabled atomistic design of
Event Details
Danna Freedman
Affiliation: F. G. Keyes Professor of Chemistry, Massachusetts Institute of Technology
Date: Dec 16th, 2021; 10:00 – 11:00 (KST) / Dec 15th, 20:00 – 21:00 (EST)
Chemically enabled atomistic design of quantum systems
Quantum information science encompasses all areas in which quantum
control can impact the world around us. Applications range from
quantum computing, to quantum sensing, to quantum communications.
Within each of these areas the requirements for a “good” quantum unit
differ. Chemistry offers a unique approach to quantum information
science, whereby we can harness the atomistic precision inherent in
synthetic chemistry to create structurally precise, reproducible, and
tunable units. Results in this area will be presented including
creating molecules that are analogues of NV centers which we dub
molecular color centers. These molecules feature optical read-out of
spin information and offer significant promise in the realm of sensing
and potentially communication.
To participate in the talk, please, fill the Registration Form →
Time
(Thursday) 10:00 am - 11:00 am (KST) / (Wednesday) Dec 15th, 21:00 - 22:00 (EST)
Location
ZOOM Application
Online (Zoom)
Arzhang Ardavan
Electric field control of spins in piezoelectrics, ferroelectrics, and molecules
Event Details
Arzhang Ardavan Affiliation: Professor of Physics at the Clarendon Laboratory, University of Oxford Date: August 17, 2021; Electric field control of spins in piezoelectrics, ferroelectrics, and molecules Magnetic fields are challenging to localise
Event Details
Arzhang Ardavan
Affiliation: Professor of Physics at the Clarendon Laboratory, University of Oxford
Date: August 17, 2021;
Electric field control of spins in piezoelectrics, ferroelectrics, and molecules
Magnetic fields are challenging to localise to short length scales because their sources are electrical currents. Conversely, electric fields can be applied using electrostatic gates on scales limited only by lithography. This has important consequences for the design of spin-based information technologies: while the Zeeman interaction with a magnetic field provides a convenient tool for manipulating spins, it is difficult to achieve local control of individual spins on the length scale anticipated for useful quantum technologies. This motivates the study of electric field control of spin Hamiltonians [1].
Mn2+ defects in ZnO exhibit extremely long spin coherence times and a small axial zero-field splitting. Their environment is inversion-symmetry-broken, and the zero-field splitting shows a linear dependence on an externally applied electric field. This control over the spin Hamiltonian offers a route to controlling the phase of superpositions of spin states using d.c. electric field pulses, and to driving spin transitions using microwave electric fields [2]. An analogous sensitivity to external electric fields is exhibited by Fe3+ defect spins in the archetypal ferroelectric PbTiO3. The Fe spin anisotropy axis is set by the ferroelectric order, so the spin Hamiltonian is controllable by manipulating the ferroelectric polarization direction [3].
Electric fields may couple to spins in molecular magnets by a range of mechanisms [4], including via intramolecular exchange interactions or hyperfine interactions, as well as through anisotropy terms. Through chemical design it is possible to optimise the conditions for molecular spin-electric coupling, yielding systems showing strong effects [5].
References:
[1] W. Mims, The linear electric field effect in paramagnetic resonance (Oxford University Press, 1976)
[2] R.E. George et al., Phys. Rev. Lett. 110, 027601 (2013)
[3] J. Liu et al., Sci. Adv. 7, eabf8103 (2021)
[4] J. Liu et al., Phys. Rev. Lett. 122, 037202 (2019)
[5] J. Liu et al., arXiv:2005.01029, to appear in Nat. Phys.
To participate in the talk, please, fill the Registration Form →
Time
All Day (Tuesday) KST
Location
ZOOM Application
Online (Zoom)
Andrea Morello
Quantum information and quantum foundations with spins in silicon
Event Details
Andrea Morello Affiliation: University of New South Wales Date: May 25, 2020; 17:00 - 18:30 Quantum information and quantum foundations with spins in silicon TBA To participate in the talk,
Event Details
Andrea Morello
Affiliation: University of New South Wales
Date: May 25, 2020; 17:00 – 18:30
Quantum information and quantum foundations with spins in silicon
TBA
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Time
(Tuesday) 5:00 pm - 6:30 pm KST
Location
ZOOM Application
Lieven Vandersypen
Quantum Computation and Simulation
– Spins inside
Event Details
Lieven Vandersypen Affiliation: Delft University of Technology Date: March 23, 2021; 17:00 - 18:00 Quantum Computation and Simulation – Spins inside Excellent control of over 50 quantum bits has been achieved, but can we
Event Details
Lieven Vandersypen
Affiliation: Delft University of Technology
Date: March 23, 2021; 17:00 – 18:00
Quantum Computation and Simulation – Spins inside
Excellent control of over 50 quantum bits has been achieved, but can we scale up quantum computers to solve relevant problems? Quantum bits encoded in the spin state of individual electrons in silicon quantum dot arrays have emerged as a highly promising avenue. In this talk, I will present our vision of a large-scale spin-based quantum processor, and our ongoing work to realize this vision. I will also show how the same quantum dot arrays offer a powerful platform for analog quantum simulation of Fermi-Hubbard physics and quantum magnetism.
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Time
(Tuesday) 5:00 pm - 6:00 pm KST
Location
ZOOM Application
Junho Suh
Nanomechanical oscillators for quantum technology
Event Details
Junho Suh Affiliation: Korea Research Institute of Standards and Science (KRISS) Date: November 24, 2020; 16:00 - 17:00 Nanomechanical oscillators for quantum technology Nanomechanical oscillators have been employed as
Event Details
Junho Suh
Affiliation: Korea Research Institute of Standards and Science (KRISS)
Date: November 24, 2020; 16:00 – 17:00
Nanomechanical oscillators for quantum technology
Nanomechanical oscillators have been employed as precision sensors in a diverse range of physical measurements. These tiny yet powerful mechanical sensors reached the single-phonon regime recently and they demonstrate operations near ground states repeatedly. I will review current progress in the field of quantum nanomechanical sensors and discuss KRISS’s approach in applying the nanomechanical oscillators for quantum technology.
To participate in the talk, please, fill the Registration Form →
Time
(Tuesday) 4:00 pm - 5:00 pm KST
Location
ZOOM Application