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Events for March 14 - August 8

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March 2019

CQC2T Seminar (UNSW Sydney) Valley interference-insensitive exchange for donor-based quantum architectures

March 14 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

Speaker -  Dr Benoit Voisin, UNSW Sydney:

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CQC2T Seminar (UNSW Sydney): Coherent spin control of s-, p-, d- and f-electrons in a silicon quantum dot

March 21 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

Speaker - Ross Leon, UNSW Sydney: Once the periodic properties of atoms were unveiled, chemical bonds could be understood in terms of the valence of atoms. Ideally, this rationale would extend to quantum dots,and quantum computation would be performed by merely controlling electrons in the outer shell. Imperfections in the semiconductor material, even at the atomic scale, disrupt this analogy between atoms and quantum dots, so that real devices seldom display such intelligible many-electron arrangement. We demonstrate here an electrostatic…

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CQC2T Seminar (UNSW Sydney): Detecting single infrared photons with 95% system efficiency

March 28 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

Speaker - Ian Berkman, UNSW Sydney: The past decade has seen an astonishing increase in interest in single photon detector technologies with high detection efficiency and fast reset times. Besides single-photon detectors being one of the key elements in quantum optics experiments, a major driver of the current research into achieving a high efficiency performance is the explosive growth of the field of quantum-information science. Furthermore, fast reset times enables future quantum optics experiments that require the detection of rapid…

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April 2019

CQC2T Seminar (UNSW Sydney) Coupled erbium ions in silicon

April 4 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

Speaker - Dr Chunming Yin: Erbium has been use widely in fibre optics technology for its telecom wavelength optical transition and it has proven to have long spin life-time and coherence time . Optical access to single erbium ions in silicon is appealing for integrating spin devices by coupling distant single spins using silicon-based optical cavities. In previous work, we developed an optical/electrical hybrid approach to address the electron and nuclear spins of a single erbium ion in a silicon nan-transistor.…

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CQC2T Seminar (UNSW Sydney): Development of 3D P in Si quantum computing architecture for error correction

April 18 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

Speaker - Mr Mitchell Kiczynski, UNSW Sydney: Phosphorus donor devices in silicon fabricated using STM hydrogen resist lithography are typically fabricated in a 2D design using a single lithographic layer. However in order to achieve quantum error correction with a surface code architecture we need to be able to fabricate devices in three dimensions using multiple lithographic layers . Here I will present on the fabrication challenges associated with transitioning from single layer devices to a multilayer structure and the…

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May 2019

CQC2T Seminar (UNSW Sydney): A silicon quantum-dot-coupled nuclear spin qubit

May 2 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

Speaker - Dr Wister Huang: Nuclear spins in the solid state have long been envisaged as a platform for quantum computing, due to their long coherence times and excellent controllability. Measurements can be performed via localized electrons, for example those in single atom dopants or crystal defects. In quantum dots, on the other hand, the electron wavefunction typically overlaps with many nuclear spins, leading to undesired effects such as loss of coherence and spin relaxation. However, tunable interdot electron tunnelling…

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CQC2T Seminar (UNSW Sydney): Charge detection mechanism study of single erbium ion in a silicon transistor by pulsed light

May 9 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

Speaker -  Mr Guongchong Hu, UNSW Sydney: Here we would report the charge detection mechanism of a single erbium ion in a silicon transistor by pulsed light. Erbium atoms were implanted in a silicon transistor and then the device was cooled down to 4K. In the continuous wavelength scan, we saw a binary signal when the erbium ion is on resonant, and in the time traces for the on resonant wavelength, we saw a RTS type signal vs time. Based…

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CQC2T Seminar (UNSW Sydney): Nagaoka ferromagnetism in a quantum dot plaquette

May 16 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

Speaker - Dr Juan Pablo Dehollain, UTS: The analytical tractability of Nagaoka ferromagnetism makes it a convenient model to explore the capabilities of quantum simulators of collective electron interactions. However, the small ground-to-excited state energy compared to electron interactions, as well as the difficulty of measuring magnetization in few particle devices, have made the Nagaoka model experimentally unattainable. In this talk, I will describe the experiments leading to the observation of signatures of the ferromagnetic ground state, predicted for 3…

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June 2019

Anisotropic spin-orbit coupling in silicon quantum dot qubits – A/Prof Rajib Rahman (UNSW Colloquia Series)

June 18 @ 12:00 am

Presenter: A/Prof Rajib Rahman

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July 2019

CQC2T Seminar (UNSW Sydney): Repetitive electron spin readout in a silicon quantum dot

July 11 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

Speaker - Dr Jun Yoneda, UNSW Sydney: Although single-shot measurement of a silicon electron spin qubit is now a laboratory routine, the quantum non-demolition (QND) implementation remains a key challenge towards error correction. A QND spin readout is distinct in that it imposes minimal disturbance to the measured spin polarization and is therefore repeatable. In this talk, we report a QND readout of a single electron spin in a Si/SiGe quantum dot by probing an ancilla electron spin in a…

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August 2019

CQC2T SEMINAR (UNSW Sydney): Single-electron spin qubits in isotopically-enriched silicon at low magnetic field

August 8 @ 3:00 pm - 4:00 pm
Old Main Building, UNSW, Room G59, Old Main Building, UNSW Kensington Campus NSW Australia

SPEAKER -  Dr Tuomo Tanttu, UNSW Sydney:   Many single-electron spin qubits employ magnetic fields at the order of 1 Tesla or above to enable quantum state readout via spin-dependent-tunnelling to an electron reservoir. This requires demanding microwave engineering for coherent spin resonance control and significant on-chip real estate, both of which limit the prospects for large scale multi-qubit systems. Alternatively, single-triplet (ST) readout enables high-fidelity spin-state measurement in much lower magnetic field . Here, we enable low-field characterization of…

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