Hardness of decoding quantum stabilizer codes

In this article we address the computational hardness of optimally decoding a quantum stabilizer code. Much like classical linear codes, errors are detected by measuring certain check operators which yield an error syndrome, and the decoding problem consists of determining the most likely recovery given the syndrome. The corresponding classical problem is known to be NP-complete, and a similar decoding problem for quantum codes is also known to be NP-complete. However, this decoding strategy is not optimal in the quantum setting as it does not take into account error degeneracy, which causes distinct errors to have the same effect on the code. Here, we show that optimal decoding of stabilizer codes is computationally much harder than optimal decoding of classical linear codes, it is #P

Studies on vibration of some rib-stiffened cantilever plates

The vibrational mode shapes and frequencies of rib-stiffened skew cantilever plates as determined by holographic interferometry are given. The effects of varying the sweep back angle, rib stiffness and aspect ratio are studied along with the influence of varying the boundary conditions at the root chord on the vibrational behavior of the plates. The study is applicable to investigating the vibrational behavior of stiffened plates often used in the design of guided rockets and missiles

First record of of unicorn sole, Aesopia cornuta (Kaup,1858)along the malabar coast

Flat fishes are very important demersal fishery resources contributing 4% of the trawl landings along the malabar coast. Flat fishes of the family cynoglossidae support the commercial flatfish fishery of malabar regeion, but the occurrence of flat fish of the family soledae is not common.The distingushing character of this species is brown colour with 14 -16 dark band edged with black, with some pale spots

First record of bandfish, Acanthocepola limbata (Valencienness, 1835) from Malabar region

The family Cepolidae comprises of 23 species of fish in five genera, all of which are found in eastern Atlantic and wide spread in central Indo-Pacific. The species Acanthocepola limbata (Valencienness, 1835) is a meso bathypelagic species distributed circumglobally. In the Indian waters, it has been recorded from Karwar (Kulkarni and Balasubramanian, 1978)

A linear-time benchmarking tool for generalized surface codes

Quantum information processors need to be protected against errors and faults. One of the most widely considered fault-tolerant architecture is based on surface codes. While the general principles of these codes are well understood and basic code properties such as minimum distance and rate are easy to characterize, a code's average performance depends on the detailed geometric layout of the qubits. To date, optimizing a surface code architecture and comparing different geometric layouts relies on costly numerical simulations. Here, we propose a benchmarking algorithm for simulating the performance of surface codes, and generalizations thereof, that runs in linear time. We implemented this algorithm in a software that generates performance reports and allows to quickly compare different architectures

Occurrence of cockatoo righteye flounder, Samaris cristatus (Gray, 1831) along the Malabar coast

Flatfishes are readily distinguished from all other fishes by their compressed body and head with both eyes on the same side, either on the right or left. They belong to the order Pleuronectiformes and are divided into eleven families Achiridae, Achiropsettidae, Bothidae, Citharidae, Cynoglossidae, Paralichthyidae, Pleuronectidae, Psettodidae, Samaridae, Scophthalmidae and Soleidae. The fishes belonging to the family Samaridae have eyes on the right side of head. They occur in all the oceans and about 20 species belonging to three genera are found worldwide

First record of ocean sunfish, Mola mola from Malabar coast

Ocean sunfishes of the family Molidae are large pelagic fishes rarely found along the south-west coast of India. Presently, four species are recognised under this family throughout the world. An ocean sunfish,Mola mola was landed in Beypore fishing harbour, Calicut on 14.12.06.It was caught in trawl net which operated north-west off Calicut at a depth of 70 m. The specimen is preserved in the museum for future reference

First record of snaggletooth shark, Hemipristis elongatus (Klunzinger,1871) from Malabar Coast

Unusual landings of the shark,Hemipristis elongatus by multi-day trawlers were noticed for the first time along Malabar Coast in September,2003.It is aslender bodied shark with a long broadly rounded snout;large cured,saw-edged teeth in the upper jaw and hooked lower teeth protruding from mouth.Fins are strongly cured