China

Quantum 2020

Quantum-dot single photon sources: Progresses and Applications

The Institute of Physics and IOP Publishing, in partnership with the Chinese Physical Society (CPS) and the University of Science and Technology of China (USTC) are proud to have brought together the international quantum science community online for this inaugural conference.


Early career and leading researchers from universities, industry and government worldwide came together to share, learn and collaborate on the latest research and emerging areas of high interest across quantum science and technology. The broad themes covered by Quantum 2020 included:

Quantum communication;
Quantum computing and quantum simulation;
Quantum sensing, metrology and imaging;
Quantum information theory, software and algorithms;
Quantum foundations;
Quantum technology in industry.
The four-day event featured talks from world-renowned scientists, interactive poster sessions and two exciting panel discussions on the themes of Quantum Technology in Industry and Quantum Technology Programmes Around the World.


You will need to [register](https://www.iopconferences.org/iop/frontend/reg/tRegisterEmailNew.csp?pageID=978403&eventID=1552&tempPersonID=536224) to obtain a ticket. . If you have already registered you should have been sent an email from Underline (to the email address that you registered with) with the subject line ‘Welcome to Quantum 2020’. This email includes your ticket for the event. 

If you have a ticket and are experiencing problems in accessing the event, please contact us. 

The Institute of Physics and IOP Publishing, in partnership with the Chinese Physical Society (CPS) and the University of Science and Technology of China (USTC) are proud to have brought together the international quantum science community online for this inaugural conference.

Early career and leading researchers from universities, industry and government worldwide came together to share, learn and collaborate on the latest research and emerging areas of high interest across quantum science and technology. 

invited talk

"Trapped ions are among the best-controlled quantum systems. However, for molecules, a similar degree of control currently lacks due to their complex energy-level structure. Quantum-logic protocols in which atomic ions serve as probes for molecular ions are a promising route for achieving this level of control. Here, I will describe our experimental results in achieving >99% fidelity in the quantum-nondemolition state detection of the nitrogen ion's electronic, vibration, and rotation ground state [1], thus making a crucial step towards the coherent manipulation of molecular quantum states. We further exploited our quantum-logic protocol for hyperfine and Zeeman resolved state identification and preparation in a complex region of the molecular spectrum, mimicking the situation encountered with polyatomic molecules [2]. The quantum control of rotation and vibration of molecules will open up opportunities for creating new time standards in the THz domain [3], searching new physics, improving molecular calculations, performing state-to-state controlled chemistry, and encoding quantum information in molecular qubits in quantum-computation and communication applications.

[1] Sinhal, Meir, Najafian, Hegi, Willitsch, Science 367, 1213 (2020).
[2] Najafian, Meir, Sinhal, Willitsch, arXiv:2004:05306 (2020).
[3] Najafian, Meir, Willitsch, arXiv:2007.11097 (2020)."

Quantum-logic state detection and preparation of rovibrational molecular states

"Protecting qubits from errors is mandatory to realize scalable quantum computing platforms. However, standard quantum error correction (QEC) codes based on multi-qubit encoding yield a large increase in the number of physical qubits and operations, thus making the control of such a platform very demanding.

Here we show that Molecular Nanomagnets can be used to easily overcome this limitation, by naturally embedding quantum error corrected units in a single multi-level molecule.

This is made possible by the rich and chemically tunable spectrum of these systems, characterized by many accessible levels with long coherence times. We perform a perturbative expansion of the Lindbald equation to design a scheme, based on such molecular qudits, which efficiently protects them from real errors, induced by pure dephasing. We then derive the sequence of pulses actually implementing QEC on a real spin system and demonstrate the effectiveness of our approach by numerical simulations.

We already get a remarkable gain (up to an order of magnitude) in the final error with a simple existing molecule consisting of a  nuclear qudit coupled to an electronic ancilla, used for error detection. This gain is further improved by scaling to larger spins, as we quantitatively analyze."

Molecular Nanomagnets as Qubits with Embedded Quantum-Error Correction

Many-body physics with arrays of individual atoms

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Quantum-dot single photon sources: Progresses and Applications

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Quantum-logic state detection and preparation of rovibrational molecular states

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