132 research outputs found
Effects of dietary pretreated Chinese herbal medicine supplementation on production performance, egg quality, uterine histopathological changes, and antioxidant capacity in late-phase laying hens
Aims: The study aimed to evaluate the effects of pretreated Chinese herbal medicine (PCHM) on egg quality, production performance, histopathological changes in the uterus, antiox idant capacity, and antioxidant gene expression in late-phase layers.Methods: Jinghong No.1 layers (n = 360, 68 weeks old) were assigned randomly to one of f our dietary interventions. Each treatment was replicated six times. Repeat 15 chickens per g roup. All birds were fed a diet composed of a corn-soybean meal-based diet supplemented with 0, 0.2, 0.4, or 0.8% PCHM for 6 weeks.Results: Dietary PCHM supplementation had no significant effects on laying rate, feed con sumption, yolk color, and shape index. With increasing PCHM level the Haugh unit linearly increased (P < 0.05). Supplementation of 0.8% PCHM increased egg weight, compared with the control (P < 0.05). PCHM can effectively alleviated the pathological changes caused by aging in the uterus including hemorrhage, and many inflammatory cell infiltrations. Supplementation of 0.4% PCHM increased glutathione peroxidase (GSHPx) in liver, magnum, and plasm considerably, compared with the control (P < 0.05). Supplementation of PCHM decr ease in the liver, magnum, and uterus on malondialdehyde (MDA) content, compared with the control (P < 0.05). Compared with the control group, mRNA expressions of glutathione peroxidase 1 (GPX1), peroxidase 4 (GPX4), catalase (CAT), and nuclear factor E2-related factor 2 (Nrf2) in the magnum, liver, and uterus were dramatically rose in the 0.4% PCHM supplementation group (P < 0.05). In summary, dietary supplementation after PCHM increased egg weight and quality in late-phase laying hens.Conclusion: Dietary PCHM increased the antioxidative capacity of late-phase laying hens, which could be associated with increased mRNA expression of antioxidant enzymes and Nrf2. These findings provide potential for using PCHM to increase the production performance in late-phase laying hens
Observation of eight-photon entanglement
Using ultra-bright sources of pure-state entangled photons from parametric
down conversion, an eight-photon interferometer and post-selection detection,
we demonstrate the ability to experimentally manipulate eight individual
photons and report the creation of an eight-photon Schr\"odinger cat state with
an observed fidelity of .Comment: 6 pages, 4 figure
Experimental exploration of five-qubit quantum error correcting code with superconducting qubits
Quantum error correction is an essential ingredient for universal quantum
computing. Despite tremendous experimental efforts in the study of quantum
error correction, to date, there has been no demonstration in the realisation
of universal quantum error correcting code, with the subsequent verification of
all key features including the identification of an arbitrary physical error,
the capability for transversal manipulation of the logical state, and state
decoding. To address this challenge, we experimentally realise the
code, the so-called smallest perfect code that permits
corrections of generic single-qubit errors. In the experiment, having optimised
the encoding circuit, we employ an array of superconducting qubits to realise
the code for several typical logical states including the magic
state, an indispensable resource for realising non-Clifford gates. The encoded
states are prepared with an average fidelity of while with a high
fidelity of in the code space. Then, the arbitrary single-qubit
errors introduced manually are identified by measuring the stabilizers. We
further implement logical Pauli operations with a fidelity of
within the code space. Finally, we realise the decoding circuit and recover the
input state with an overall fidelity of , in total with gates.
Our work demonstrates each key aspect of the code and verifies
the viability of experimental realization of quantum error correcting codes
with superconducting qubits.Comment: 6 pages, 4 figures + Supplementary Material
Laboratory observation of ion acceleration via reflection off laser-produced magnetized collisionless shocks
Fermi acceleration by collisionless shocks is believed to be the primary
mechanism to produce high energy charged particles in the Universe,where
charged particles gain energy successively from multiple reflections off the
shock front.Here,we present the first direct experimental evidence of ion
energization from reflection off a supercritical quasi perpendicular
collisionless shock,an essential component of Fermi acceleration in a laser
produced magnetized plasma. We observed a quasi monoenergetic ion beam with 2,4
times the shock velocity in the upstream flow using time of flight method. Our
related kinetic simulations reproduced the energy gain and showed that these
ions were first reflected and then accelerated mainly by the motional electric
field associated with the shock. This mechanism can also explain the quasi
monoenergetic fast ion component observed in the Earth's bow shock
A millisecond quantum memory for scalable quantum networks
Scalable quantum information processing critically depends on the capability
of storage of a quantum state. In particular, a long-lived storable and
retrievable quantum memory for single excitations is of crucial importance to
the atomic-ensemble-based long-distance quantum communication. Although atomic
memories for classical lights and continuous variables have been demonstrated
with milliseconds storage time, there is no equal advance in the development of
quantum memory for single excitations, where only around 10 s storage time
was achieved. Here we report our experimental investigations on extending the
storage time of quantum memory for single excitations. We isolate and identify
distinct mechanisms for the decoherence of spin wave (SW) in atomic ensemble
quantum memories. By exploiting the magnetic field insensitive state, ``clock
state", and generating a long-wavelength SW to suppress the dephasing, we
succeed in extending the storage time of the quantum memory to 1 ms. Our result
represents a substantial progress towards long-distance quantum communication
and enables a realistic avenue for large-scale quantum information processing.Comment: 11pages, 4 figures, submitted for publicatio
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