Research Progress

18 Qubits: USTC Scientists Set New Quantum Entanglement Record

The new world record of 18-qubit quantum entanglement with six photons’ three degrees of freedom (6 × 3 = 18) has been achieved by USTC physicists PAN Jianwei (project leader), LU Chaoyang, LIU Naile, WANG Xilin et al., surpassing the previous world record of 10-qubit entanglement they made in 2016. The successful control over the high-dimensional entanglement is the key for speeding up quantum computing and the future quantum network. This breakthrough was published as the Editors’ Suggestion in the journal Physical Review Letters within only three weeks of submission.

USTC Conducts the First Experiment on Boson Sampling with Photon Loss

Professor PAN Jianwei and Professor LU Chaoyang of the University of Science and Technology of China (USTC) carry out an experiment on boson sampling with photon loss in collaboration with Researcher YOU Lixing’s group of Shanghai Institute of Microsystem and Information Technology (SIMIT) of Chinese Academy of Sciences (CAS). The results show that boson sampling with a few photons lost can increase the sampling rate, which brings a demonstration of quantum supremacy closer to reality. This research is published in Physical Review Letters on June 6th as one of Editor’s Suggestions. The American Physical Society website Physics comments on the paper with a Viewpoint article entitled “Lost Photons Won’t Derail Quantum Sampling”.

[Xinhua] Chinese scientists conduct ground-to-space quantum teleportation

"Beam me up, Scotty." The famous "Star Trek" catchphrase has launched teleporting daydreams the world over.

Now Chinese scientists have completed an experiment straight out of the realms of science fiction - quantum teleportation - from the ground to the world's first quantum satellite.

The experiment was similar in some ways to the Star Trek mode of transport, except that the scientists beamed up the quantum states of photons rather than people.

[PhysicsWorld] Particle-free quantum communication is achieved in the lab

Four years ago, theoretical physicists proposed a new quantum-communication scheme with a striking feature: it did not require the transmission of any physical particles. The research raised eyebrows, but now a team of physicists in China claims it has demonstrated that the "counterfactual" scheme works. The group built an optical apparatus that it says can transfer a simple image while sending (almost) no photons in the process.

[Physics] Synopsis: Ten Photons in a Tangle

An entangled polarization state of ten photons sets a new record for multiphoton entanglement. Quantum computing requires multiple qubits entangled together. So far, only a handful of qubits have been coupled together successfully. A new experiment raises the bar with the entangling of ten photons, two more than the previous photon record. While still a ways off from what’s needed to make quantum computers competitive with classical ones, the entanglement of this many photons might be sufficient for certain quantum error correction codes and teleportation experiments.

Two-dimensional Spin-orbit Coupling for Bose-Einstein Condensates Realized

Spin-orbit coupling is one of the fundamental effects in quantum physics. It plays a vital role in many basic physic phenomena and exotic quantum states. These phenomena led to the foundation of several important research fields in condensed-matter physics like spintronics, topological insulator and topological superconductor. However, due to common problem of uncontrollable complex environment, many researches of solid materials of exotic physics become extremely difficult. This remains a major challenge for many relevant researches.

Scientists Make a Critical Step towards the Realization of a Global ‘Quantum Internet’

Quantum teleportation faithfully transfers a quantum state between distant nodes in a network, which enables revolutionary information-processing applications. However, in the past not a single quantum-teleportation experiment has been realized with independent quantum sources, entanglement distribution prior to the Bell-state measurement (BSM) and feedforward operation simultaneously, even in the laboratory environment.