Phys.org August 24, 2024 The distribution of high-fidelity high-rate entanglement over telecommunication infrastructure is one of the main paths toward large-scale quantum networks, enabling applications such as quantum encryption and network protection, blind quantum computing, distributed quantum computing, and distributed quantum sensing. However, the fragile nature of entangled photons operating in real-world fiber infrastructure has historically limited continuous operation of such networks. A company in New York presented a fully automated system capable of distributing polarization-entangled photons over a 34-km deployed fiber in New York City, achieving high rates of nearly 5×105 pairs/s. They demonstrated high fidelity of approximately 99% […]
Category Archives: Quantum internet
Physicists develop new method to combine conventional internet with the quantum internet
Phys.org August 5, 2024 A promising and scalable route to enable quantum networking is encoding quantum information into the frequency of photons. While the cointegration of frequency-entangled photons with coherent information transmission is achieved via spectral multiplexing, more resource-efficient approaches are required. Researchers in Germany introduced and experimentally demonstrated a transceiver concept that enabled the transmission of coherent and frequency-entangled photons over a single-frequency channel. They leveraged the serrodyne technique via electro-optic phase modulation leading to very different dynamics for entangled and coherent photons. This enabled temporal multiplexing of the respective signals. They demonstrated the preservation of entanglement over the […]
Research team takes a fundamental step toward a functioning quantum internet
Phys.org February 7, 2024 Quantum repeater networks require independent absorptive quantum memories capable of storing and retrieving indistinguishable photons to perform high-repetition entanglement swapping operations. An international team of researchers (USA – Stony Brook University, industry, Brookhaven National Laboratory, Italy) performed Hong-Ou-Mandel (HOM) interference between photonic polarization states and single-photon-level pulses stored and retrieved from two sets of independent room-temperature quantum memories. They showed that the storage and retrieval of polarization states from quantum memories did not degrade the HOM visibility for few-photon-level polarization states in a dual-rail configuration. For single-photon-level pulses, they measured the HOM visibility with various levels […]
New experiment translates quantum information between technologies in an important step for the quantum internet
Phys.org March 24, 2023 Whereas ultracold atoms and superconducting circuits have since taken independent paths in the exploration of new physics, taking advantage of their complementary strengths in an integrated system enables access to fundamentally new parameter regimes and device capabilities. Taking advantage of their complementary strengths in an integrated system a team of researchers in the US (University of Chicago, Stanford University) developed a system, coupling an ensemble of cold 85Rb atoms simultaneously to an optically accessible, three-dimensional superconducting resonator and a vibration-suppressed optical cavity in a cryogenic (5 K) environment. To demonstrate the capabilities of the platform, they leveraged […]
Researchers find the missing photonic link to enable an all-silicon quantum internet
Phys.org July 13, 2022 The global quantum internet will require long-lived, telecommunications-band photon–matter interfaces manufactured at scale. Preliminary quantum networks based on photon–matter interfaces that meet a subset of these demands are encouraging efforts to identify new high-performance alternatives. Silicon is an ideal host for commercial-scale solid-state quantum technologies. It is already an advanced platform within the global integrated photonics and microelectronics industries, as well as host to record-setting long-lived spin qubits. Despite the overwhelming potential of the silicon quantum platform, the optical detection of individually addressable photon–spin interfaces in silicon have remained elusive. In their work researchers in Canada […]
Towards an unhackable quantum internet
Eurekalert March 23, 2020 To send quantum signals across large distances without loss a team of researchers in the US (Harvard University, MIT) found a way to correct for signal loss with a prototype quantum node that can catch, store and entangle bits of quantum information by integrating an individual color-center into a nanofabricated diamond cavity, which confines the information-bearing photons and forces them to interact with the single color-center. They placed the device in a dilution refrigerator, which reaches temperatures close to absolute zero, and sent individual photons through fiber optic cables into the refrigerator, where they were efficiently […]
World’s first link layer protocol brings quantum internet closer to a reality
Phys.org August 20, 2019 Researchers in the Netherlands have developed a link layer protocol they identified for use in fundamental and technological design considerations of quantum network hardware. They illustrated it by considering the state-of-the-art quantum processor platform, Nitrogen-Vacancy (NV) centers in diamond. They examined the robustness and performance of the protocol. They implemented the protocol and successfully validated the physical simulation model against data gathered from the NV hardware. The protocol is robust. They studied the performance of the protocols for 169 distinct simulation scenarios and initiated the study of quantum network scheduling strategies to optimize protocol performance for […]
QuTech researchers put forward a roadmap for quantum internet development
Delft University of Technology (the Netherlands) October 18, 2018 Researchers in the Netherlands describe six phases, starting with simple networks of qubits that could already enable secure quantum communications – a phase that could be reality in the near future. The development ends with networks of fully quantum-connected quantum computers. In each phase, new applications become available such as extremely accurate clock synchronization or integrating different telescopes on Earth in one virtual ‘supertelescope’. This work creates a common language that unites the highly interdisciplinary field of quantum networking towards achieving the dream of a world-wide quantum internet… read more. TECHNICAL […]