Phys.org September 6, 2024 Standard approaches to quantum error correction for fault-tolerant quantum computing result in asymptotically zero encoding rates and huge resource overheads. Researchers in Japan proposed concatenated high-rate small-size quantum error-detecting codes as a family of high-rate quantum codes. Their structure allowed for a geometrical interpretation using hypercubes corresponding to logical qubits. Using their method of many-hypercube codes they realized both high rates, e.g., 30% (64 logical qubits are encoded into 216 physical ones), and parallelizability of logical gates. Developing dedicated decoder and encoders, achieved high error thresholds even in a circuit-level noise model. According to the researchers […]
Category Archives: Quantum computing
Higher-order topological simulation unlocks new potential in quantum computers
Phys. org August 30, 2024 At present the range of viable applications with noisy intermediate-scale quantum (NISQ) devices remains limited by gate errors and the number of high-quality qubits. An international team of researchers (USA – Caltech, MIT, Singapore) developed an approach that places digital NISQ hardware as a versatile platform for simulating multi-dimensional condensed matter systems. Their method encoded a high-dimensional lattice in terms of many-body interactions on a reduced-dimension model, thereby taking full advantage of the exponentially large Hilbert space of the host quantum system. With circuit optimization and error mitigation techniques, they measured the topological state dynamics […]
Manipulation of nanolight provides new insight for quantum computing and thermal management
Phys.org August 26, 2024 Anisotropic planar polaritons – hybrid electromagnetic modes mediated by phonons, plasmons, or excitons – in biaxial two-dimensional (2D) van der Waals crystals have attracted significant attention due to their fundamental physics and potential nanophotonic applications. An international team of researchers (USA – University of Minnesota, Auburn University, Purdue University, City University of New York, IBM T. J. Watson Research Center, Vanderbilt University, Republic of Korea, Spain) reviewed the properties of planar hyperbolic polaritons and methods that could be used to experimentally tune them. They argued that such natural, planar hyperbolic media should be common in biaxial […]
Layered superconductor coaxed to show unusual properties with potential for quantum computing
Phys.org July 31, 2024 Chiral superconductors are a unique class of unconventional superconductors in which the complex superconducting order parameter winds clockwise or anticlockwise in the momentum space. It represents a topologically non-trivial system with intrinsic time-reversal symmetry breaking (TRSB) and direct implications for topological quantum computing. Chiral molecules with neither mirror nor inversion symmetry have been widely investigated. An international team of researchers (USA – UCLA, Czech Republic) explored unconventional superconductivity in chiral molecule intercalated TaS2 hybrid superlattices. The experimental signatures of unconventional superconductivity suggested that the intriguing interplay between crystalline atomic layers and the self-assembled chiral molecular layers […]
Optical fibers fit for the age of quantum computing
Phys.org July 29, 2024 Researchers in the UK summarized recent progress in the development and applications of microstructured optical fibers for quantum technologies. The optical nonlinearity of solid-core and gas-filled hollow-core fibers provides a valuable medium for the generation of quantum resource states as well as for quantum frequency conversion between the operating wavelengths of existing quantum photonic material architectures. The low loss, low latency, and low dispersion of hollow-core fibers make these fibers particularly attractive for both short- and long-distance links in quantum networks. Hollow-core fibers also promise to replace free-space optical components in a wide range of atomic […]
Physicists propose time crystal-based circuit board to reduce quantum computing errors
Phys.org June 21, 2024 Time crystalline structures, which can reveal different condensed matter behaviors, can be created in periodically driven systems. However, the potential practical applications of time crystalline structures have yet to be explored. An international team of researchers (Poland, Australia) paved the way for timetronics where temporal lattices were like printed circuit boards for realization of a broad range of quantum devices. The elements of these devices corresponded to structures of dimensions higher than three and could be arbitrarily connected and reconfigured at any moment. Their approach allowed for the construction of a quantum computer, enabling quantum gate […]
Quantum computing trade-off problem addressed by new system
Phys.org June 18, 2024 The lack of nonlinearity in photonics has led to encoded measurement-based quantum computing, which relies on linear operations but requires access to resourceful (’nonlinear’) quantum states. In contrast, superconducting microwave circuits offer engineerable nonlinearities but suffer from static Kerr nonlinearity. An international team of researchers (Sweden, Germany) demonstrated universal control of a bosonic mode composed of a superconducting nonlinear asymmetric inductive element (SNAIL) resonator, enabled by native nonlinearities in the SNAIL element. They suppressed static nonlinearities and dynamically activated nonlinearities up to third order by fast flux pulses. They experimentally realized a universal set of generalized […]
Study of photons in quantum computing reveals that when photons collide, they create vortices
Phys.org June 6, 2024 All-optical generation of photonic vortices requires sufficiently strong nonlinearity that is typically achieved in the classical optics regime. Researchers in Israel realized quantum vortices of photons that resulted from a strong photon-photon interaction in a quantum nonlinear optical medium. The interaction caused faster phase accumulation for copropagating photons, producing a quantum vortex-antivortex pair within the two-photon wave function. For three photons, the formation of vortex lines and a central vortex ring confirmed the existence of a genuine three-photon interaction. The wave function topology, governed by two- and three-photon bound states, imposed a conditional phase shift of […]
The experimental demonstration of a verifiable blind quantum computing protocol
Phys.org April 13, 2024 An international team of researchers (UK, France, USA -University of Maryland) used a trapped-ion quantum server and a client-side photonic detection system networked via a fiber-optic quantum link. The availability of memory qubits and deterministic entangling gates enabled interactive protocols without post selection which previous realizations could not provide. They quantified the privacy at ≲0.03 leaked classical bits per qubit. According to the researchers their experiment demonstrated a path to fully verified quantum computing in the cloud… read more. Open Access TECHNICAL ARTICLE
Scientists launch hub to channel quantum power for good
Phys.org March 5, 2024 The Open Quantum Institute seeks to inclusively unleash the powers of quantum computing to ensure that the whole world contributes to and benefits from quantum computing. While traditional computers process information in bits that can be represented by 0 or 1, quantum computers use qubits, which can be a combination of both at the same time, allowing them to solve more complex problems. The first commercial quantum computers are still believed to be up to a decade away, and the technology is not expected to be fully developed before around 2050. With quantum computing still under […]