Initialization and Read-out of 3D Transmon qubit San

Initialization and Read-out of 3D Transmon qubit San

Initialization and Read-out of 3D Transmon qubit San Vinh Dinh Supervisor: Dr. Alexander Romanenko Helen Edwards Internship Final Presentation 29 08 2018 Qubit Building block of Quantum Computing QSIT 16 course, Qudev Group, ETH Zurich 2 03/01/2020 San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation Structure of superconducting 3D Transmon Qubit Atomic Physics Perspective Electrical Engineering Perspective Excited energy of valence electrons Different wavefunctions Hyper Physics, Hydrogen atom Excited energy of circuit Different impedances (LC circuit) https://slideplayer.com/slide/7042332/

Schuster thesis, Yale (2007) https://www.ntt-review.jp/archive/ntttechnical.php?contents=ntr200801sp6.html 3 03/01/2020 San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation Schuster thesis, Yale (2007) Why do we need Josephson junction? Why do we need a circuit as an artificial atom? SRF Cavity and Qubit Why do we use SRF cavity with the qubit? Motivation

Decoherence Qudev Group, ETH Zurich Reagor thesis, Yale (2015) Schuster thesis, Yale (2015) 4 03/01/2020 San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation Roadmap for the project Improving Quantum Memory Decoherence Time Rabi Oscillation Qubit Spectroscopy Dispersive shift Excited state

Dispersive shift Ground state 5 03/01/2020 San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation Transmon Stick 65 mm Schematic of measurement setup Port 6 Qubit Oscillator 3.7 GHz -15 dBm 0 dB 0 dB

20 dB 0 dB -15 dBm 3 dB isolated combiner Spectrum Analyzer G=40 dB NF=0.06 dB -66.5 dBm Cavity Oscillator 2.6 GHz -16.5 dBm Port 5 Variable attenuator 50 dB

6 dB 0 dB 6 dB 0 dB 20 dB 0 dB Incident G=21 dB NF=1.4 dB Transm. 2.6 GHz Cavity + transmon 6 03/01/2020 San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation

G=17 dB NF=2.4 dB Dispersive shift Ground state Method Sweeping frequency and power of input signal around cavity and taking average (4000 measurements) Dispersive shift at low power Photon numbers: around 10^5, ideally 1 Why do we need low powers? Sweeping power and frequency 7 03/01/2020 Sgen Cavity Drive 2.6 GHz Cavity San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation

Spectrum Analyser Qubit Spectroscopy f01 Looking the frequency and power that the Ground State Dispersive peak disappear Why do we see multiple peaks at varied powers? f02/2 f12 f03/3 Sweeping power and frequency 8 03/01/2020 SGen Cavity Drive SGen Qubit

Drive Qubit energy level Michael thesis, Oxford (2016) 2.6 GHz Cavity San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation Multiphoton absorption From book: Frontiers in Guided Wave Optics and Optoelectronics Spectrum Analyser Dispersive shift Excited state Reading out Excited State Sweep frequencies of qubit and cavity Expected shift: 140 Hz Actual shift: 50 Hz Sweeping frequency Sweeping frequency

9 03/01/2020 SGen Cavity Drive SGen Qubit Drive Michael thesis, Oxford (2016) 2.6 GHz Cavity San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation Spectrum Analyser Rabi Oscillation Bianchetti, Phys. Rev. A 80, 043840 (2009) http://www.wmi.badw.de/teaching/ Lecturenotes/AS/AS2013_Chapter10_2_Slides.pdf

QuDev Group, Summer school ETH Zurich 10 03/01/2020 San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation Rabi Oscillation SGen Cavity Drive Pulse generation + triggering Expected result Bianchetti, Phys. Rev. A 80, 043840 (2009) 11 03/01/2020 San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation Summary Quantum Memory Decoherence

Time Rabi Oscillation Qubit Spectroscopy Dispersive shift Excited state Dispersive shift Ground state Thank you for the support of: - Dr. Romanenko and Dr. Martinello Supervisor - Quantum Initiative Group and SRF Group at Technical Division - Helen Edward Internship Committee - Fermilab Administration - Other interns at Fermilab - University of St Andrews 12 03/01/2020 San Vinh Dinh | Measuring 3D Qubit - Helen Edward Internship Final Presentation

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