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UID:6592-1686067200-1686070800@quantum-bc.ca
SUMMARY:Seminar on Cryo Circuits for Quantum Computing
DESCRIPTION:IEEE SSCS/CASS Vancouver Distinguished Lecturer Talk \nCryogenic CMOS for low power quantum computing applications: Roadmap\, Present Status\, Challenges and Opportunities \nSudipto Chakraborty\, \n IBM T. J. Watson Master Inventor\, NXP Semiconductors \nJune 6th\, 4pm Pacific Time \n\nRegistration link: \nhttps://events.vtools.ieee.org/event/register/363109\n\n\nIn-person venue: \nMcLeod 3038\, \nElectrical and Computer Engineering\, \nUniversity of British Columbia \n2356 Main Mall\, Vancouver\, BC V6T 1Z4 \n\n\nZoom Link:\nJoin Zoom Meeting\nhttps://ubc.zoom.us/j/66828102935?pwd=cmFzMmRSWGFvb0hreVdialNWWW1Cdz09 \nMeeting ID: 668 2810 2935\nPasscode: 837279 \n\n\n\nThis talk will cover practical challenges for cryogenic CMOS designs for next generation quantum computing. Starting from a roadmap level understanding and future trends\, it will detail the design considerations for a non-multiplexed\, semi-autonomous\, transmon qubit state controller (QSC) implemented in 14nm CMOS FinFET technology. The QSC includes an augmented general-purpose digital processor that supports waveform generation and phase rotation operations combined with a low power current-mode single sideband upconversion I/Q mixer-based RF arbitrary waveform generator (AWG). Implemented in 14nm CMOS FinFET technology\, the QSC generates control signals in its target 4.5GHz to 5.5 GHz frequency range\, achieving an SFDR > 50dB for a signal bandwidth of 500MHz. With the controller operating in the 4K stage of a cryostat and connected to a transmon qubit in the cryostat’s millikelvin stage\, measured transmon T1 and T2 coherence times were 75.7μs and 73μs\, respectively\, in each case comparable to results achieved using conventional room temperature controls. In further tests with transmons\, a qubit-limited error rate of 7.76×10-4 per Clifford gate is achieved\, again comparable to results achieved using room temperature controls. The QSC’s maximum RF output power is -18 dBm\, and power dissipation per qubit under active control is 23mW. \n\nSudipto Chakraborty received his B. Tech from Indian Institute of Technology\, Kharagpur in 1998 and Ph.D in EE from Georgia Institute of Technology in 2002. He worked as a researcher in Georgia Electronic Design Center (GEDC) till 2004. From 2004 to 2016\, he was a senior member of technical staff at Texas Instruments where he contributed to low power integrated circuit design in more than 10 product families in the areas of automotive\, wireless\, medical and microcontrollers. Since 2017\, he has been working at the IBM T. J. Watson Research Center where he leads the low power circuit design for next generation quantum computing applications using nano CMOS technology nodes. He has authored or co-authored more than 75 papers\, two books and holds 83 US patents. He has served in the technical program committees of various conferences including CICC\, RFIC\, IMS and has been elected as an IBM master inventor in 2022 for his contributions. He is a distinguished lecturer for the SSCS and CASS societies and serves as an associate editor for TCAS-I.
URL:https://quantum-bc.ca/event/seminar-on-cryo-circuits-for-quantum-computing/
LOCATION:University of British Columbia\, Macleod Room 3038\, Vancouver\, BC\, Canada
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UID:6442-1686664800-1686668400@quantum-bc.ca
SUMMARY:QBC Seminar Series - Paul Haljan
DESCRIPTION:The Quantum BC Seminar Series is a monthly talk given by faculty in BC on various topics related to quantum computing. The talks happen on the second Tuesday of each month at 2pm. \n  \nJune.2023.Poster.Paul.Haljan \n  \nPlease join us for our fourth seminar on Tuesday\, June 13\, 2023 at 2pm with Paul Haljan from SFU who will present on Realizing a Structural Phase Transition of Trapped Ions in the Quantum Regime. \n  \nJoin on Zoom: https://ubc.zoom.us/j/69443327772?pwd=TGhhTXFIQ3ZiUmNrN0pUa3FObTNydz09 \nMeeting ID: 694 4332 7772 \nPasscode: 996727 \n  \n\nSeminar Title: Realizing a Structural Phase Transition of Trapped Ions in the Quantum Regime by Paul C Haljan\, Department of Physics\, Simon Fraser University\n\n\n\n\n\nAbstract: Arrays of trapped ions are a versatile technological platform with exquisite control over experimental parameters at the single-atom level. This allows both manipulation of the internal quantum state of the ions and control of their quantum collective vibrational motion – phonons – in the trap. A focus of my research group is advancing the technology of phononic coherent control in trapped ions. As part of this\, we are aiming to demonstrate precise manipulation of a single vibrational mode of trapped ions in order to control a quantum structural phase transition in a string of trapped ions – the 1D linear to 2D zigzag transition. This system would provide an intrinsic source of novel entangled states of ion crystal structures\, which can be manipulated through trapped ion double-well interferometry. In this talk I will describe how we experimentally control and characterize the linear-zigzag structural transition for arrays of ions confined in a linear Paul trap and cooled to near their ground state of motion. I will show how Raman sideband spectroscopy can be used as a probe to reveal both the energy level structure and the motional population distribution of the ion crystal near the critical point of the transition. I will look at what our results reveal about the nature of the transition in practice\, and finally I will consider prospects for coherence assessment near the critical point as well as potential applications in in-situ sensing of electric field noise.\n\n\n\n\nBio: Dr. Paul C. Haljan is an Associate Professor of Physics at Simon Fraser University with expertise in trapped-ion quantum technologies. Before joining SFU in 2005\, Paul performed his doctoral work on quantum vertices at Boulder and JILA and held a postdoctoral fellowship at the University of Michigan\, where he worked on quantum gate implementations in trapped-ion hardware and early algorithm demonstrations. At SFU\, the Haljan research group is focused on experiments with trapped ions\, quantum simulations and quantum state manipulation\, and technology development for trapped-ion quantum computing.
URL:https://quantum-bc.ca/event/qbc-seminar-series/
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