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Progress on superconducting multi-qubits system
Xiaobo Zhu
CAS Center for Excellence in Quantum Information and Quantum Physics
University of Science and Technology of China
HPC User Forum, 2018-04-18
Email: xbzhu16@ustc.edu.cn
Superconducting QC groups in China
IOP-China, Tsinghua university,
and Beijing Computational Science
Research Center
Nanjing university
Zhejiang university
USTC-Shanghai
Inductance
Capacitor
Josephson
Junction
Easy to scale up, but…
Basic element of superconducting quantum processor
Qubit characterizations
✓ Transmon/Xmon qubits:
Best T1 ~ 30 s (10 – 20 s on
average), T2* above 20 s ( - 10 s on
average).
✓ Single-qubit gate fidelity above
99.9% (RB), two-bits gate ~99.1%
5 qubits
6 qubits
9 qubits
10 qubits
20 qubits
…
Readout with home-made paramps
10-Qubit Entanglement with a
Superconducting Circuit
10-Qubits processor with complete connection
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Center
Resonantor
List of parameters
ωB/2π ≈ 5.795
GHZ state preparation
Full state tomography
GHZ state fidelity
is about 66% PRL 119, 180511 (2017)
4 bits HHL algorithm
4 qubits HHL algorithm
4 qubits HHL algorithm
4 qubits HHL algorithm
PRL 118.2105
04 (2017)
High Fidelity Gate
Single Qubit Gates
Single qubit gate randomized benchmarking>99.9%
Q7 at optimal point Q7 at optimal point Q7 at optimal point
Q7 at optimal point Q7 at optimal point
Q8 336MHz detuned
from optimal point
CZ Gate
CZ randomized
Benchmarking
70 random sequences
1500 averages
Introduction to Quantum Computing Cloud Accessed
QC CloudUser QC
➢ Cloud accessing is future of QC
➢ Help us to know how good and
stable we can
➢ Stimulate interest in QC
Cloud
Sever
Ultra-low noise platform
The Structure of QC Cloud System
QC control
hardware
QC software
system
QC processor
Classical
simulation
QC Processor
Q1 Q12
 12 bits, 11 of
them are opened
 1D ring
connection
 Single bit:99.7%
(RB)
 Two bit :94.9%
(Tomo)
How to use it
How to use it
Open ‘quantumcomputer.ac.cn’Input the user name and passwordClick ‘Experiment’ and ’New Experiment’Click ‘Run on real quantum processor’Drug and place for the quantum circuitClick ‘Run’Input Number of averageWait in line for the executionThe results returned
Summary
➢ We designed and fabricated several versions of quantum
processor, on which integrated up to 20 quibts
➢ The typical T1 and T2 time are both longer than 20 micro-
seconds
➢ The single-bit gate fidelity is >99.9% and for the CZ gate it
reaches 99.1% in the best case
➢ We use a four-qubit processor to solve a two-dimensional system
of linear equations, yield a process fidelity of 0.837 ± 0.006
➢ We generate a 10-bit GHZ state with a fidelity of 0.668 ± 0.025
➢ 11-bit quantum processor is online now quantumcomputer.ac.cn
Thank you for your attention!

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Quantum Computing in China: Progress on Superconducting Multi-Qubits System

  • 1. Progress on superconducting multi-qubits system Xiaobo Zhu CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China HPC User Forum, 2018-04-18 Email: xbzhu16@ustc.edu.cn
  • 2. Superconducting QC groups in China IOP-China, Tsinghua university, and Beijing Computational Science Research Center Nanjing university Zhejiang university USTC-Shanghai
  • 3.
  • 4. Inductance Capacitor Josephson Junction Easy to scale up, but… Basic element of superconducting quantum processor
  • 5. Qubit characterizations ✓ Transmon/Xmon qubits: Best T1 ~ 30 s (10 – 20 s on average), T2* above 20 s ( - 10 s on average). ✓ Single-qubit gate fidelity above 99.9% (RB), two-bits gate ~99.1% 5 qubits 6 qubits 9 qubits 10 qubits 20 qubits …
  • 7. 10-Qubit Entanglement with a Superconducting Circuit
  • 8. 10-Qubits processor with complete connection Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Center Resonantor
  • 11. Full state tomography GHZ state fidelity is about 66% PRL 119, 180511 (2017)
  • 12. 4 bits HHL algorithm
  • 13.
  • 14. 4 qubits HHL algorithm
  • 15. 4 qubits HHL algorithm
  • 16. 4 qubits HHL algorithm PRL 118.2105 04 (2017)
  • 18. Single Qubit Gates Single qubit gate randomized benchmarking>99.9% Q7 at optimal point Q7 at optimal point Q7 at optimal point Q7 at optimal point Q7 at optimal point Q8 336MHz detuned from optimal point
  • 19. CZ Gate CZ randomized Benchmarking 70 random sequences 1500 averages
  • 20.
  • 21. Introduction to Quantum Computing Cloud Accessed QC CloudUser QC ➢ Cloud accessing is future of QC ➢ Help us to know how good and stable we can ➢ Stimulate interest in QC
  • 22. Cloud Sever Ultra-low noise platform The Structure of QC Cloud System QC control hardware QC software system QC processor Classical simulation
  • 23. QC Processor Q1 Q12  12 bits, 11 of them are opened  1D ring connection  Single bit:99.7% (RB)  Two bit :94.9% (Tomo)
  • 25. How to use it Open ‘quantumcomputer.ac.cn’Input the user name and passwordClick ‘Experiment’ and ’New Experiment’Click ‘Run on real quantum processor’Drug and place for the quantum circuitClick ‘Run’Input Number of averageWait in line for the executionThe results returned
  • 26. Summary ➢ We designed and fabricated several versions of quantum processor, on which integrated up to 20 quibts ➢ The typical T1 and T2 time are both longer than 20 micro- seconds ➢ The single-bit gate fidelity is >99.9% and for the CZ gate it reaches 99.1% in the best case ➢ We use a four-qubit processor to solve a two-dimensional system of linear equations, yield a process fidelity of 0.837 ± 0.006 ➢ We generate a 10-bit GHZ state with a fidelity of 0.668 ± 0.025 ➢ 11-bit quantum processor is online now quantumcomputer.ac.cn
  • 27. Thank you for your attention!