Understanding quantum many-body systems with strong interactions and unconventional phases therein is one of the most challenging tasks in physics. In cold atom physics, this has been a focused research topic for nearly two decades, where strong interactions are naturally created and well manipulated by bringing the system close to a scattering resonance. However, most of the studies thus far have been limited to the s-wave resonance.
"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.
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.
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.
Development makes secure network that is theoretically impossible to intercept or crack China is to start construction on a quantum communication line between Wuhan, capital of Hubei province, and Hefei, the Anhui provincial capital, bringing the nation a step closer to having the world's most secure communication network.
Encryption is critical in many aspects of modern life, however, perfectly secure communication can only be achieved using the strong correlations, or entanglement, between quantum objects. Quantum key distribution (QKD) makes it possible for two distant users to share a key with unconditional security.