scholarly journals Revisiting maximal average fidelity of teleportation

2022 ◽  
pp. 126853
Author(s):  
D.G. Bussandri ◽  
M. Portesi ◽  
A.P. Majtey
Keyword(s):  
Average Fidelity ◽  
Maximal Average

scholarly journals High success perfect transmission of 1-qubit information using purposefully delayed sharing of non-maximally entangled 2-qubit resource and repeated generalized Bell-state measurements

2021 ◽  
pp. 2150015
Author(s):  
Shamiya Javed ◽  
Ranjana Prakash ◽  
Hari Prakash
Keyword(s):  
Success Probability ◽  
Bell State ◽  
Average Fidelity ◽  
Information State ◽  
The Third ◽  
Repeated Attempt ◽  
Bell Basis ◽  
Maximal Average ◽  
Collapsed States ◽  
Bell State Measurements

We propose a new scheme in which perfect transmission of 1-qubit information is achieved with high success using purposefully delayed sharing of non-maximally entangled 2-qubit resource and repeated generalized Bell-state measurements (GBSM). Alice possesses initially all qubits and she makes repeated GBSM on the pair of qubits, consisting of (1) the qubit of information state and (2) one of the two entangled resource qubits (taken alternately) until transmission with perfect fidelity is indicated. Alice then sends to Bob, the qubit not used in the last GBSM and also the result of this GBSM and Bob applies a suitable unitary transformation to replicate exactly the information state. Continued probabilistic transmission with unit fidelity is achieved by changing continuously the generalized Bell basis and also the pair of measured qubits of the collapsed states. We calculate the success probability up to the third repeated attempt of GBSM and plot it with concurrence of the entangled resource state. We also discuss the maximal average fidelity.

scholarly journals Vibroimpact Mobile Robot

2021 ◽  
Vol 17 (4) ◽  
pp. 429-436
Author(s):  
A. P. Ivanov ◽  
Keyword(s):  
Simple Model ◽  
Mobile Robot ◽  
Periodic Motion ◽  
Horizontal Plane ◽  
Coulomb Friction ◽  
Average Velocity ◽  
Moving Mass ◽  
Harmonic Force ◽  
Maximal Average ◽  
The Right

A simple model of a capsule robot is studied. The device moves upon a rough horizontal plane and consists of a capsule with an embedded motor and an internal moving mass. The motor generates a harmonic force acting on the bodies. Capsule propulsion is achieved by collisions of the inner body with the right wall of the shell. There is Coulomb friction between the capsule and the support, it prevents a possibility of reversal motion. A periodic motion is constructed such that the robot gains the maximal average velocity.

Secure-Aware Multipath Routing Using Atom Search Rider Optimization Algorithm in Wireless Sensor Networks

2021 ◽  
Vol 12 (2) ◽  
pp. 36-55
Author(s):  
M. B. Shyjith ◽  
C. P. Maheswaran ◽  
V. K. Reshma
Keyword(s):  
Routing Protocol ◽  
Multipath Routing ◽  
Cluster Head ◽  
Residual Energy ◽  
Sensor Nodes ◽  
Throughput Rate ◽  
Cluster Heads ◽  
Average Residual ◽  
Maximal Average ◽  
Selection Of

WSN is comprised of sensor nodes that sense the data for various applications. The nodes are employed for transmitting sensed data to BS through intermediate nodes or the cluster heads in multi-hop environment. Erroneous selection of CHs may lead to large energy consumption and thereby degrades system performance. Hence, an effective technique was developed by proposing Rider-ASO for secure-aware multipath routing in the WSN. The proposed routing protocol offers security to the network concerning various trust factors. Initially, cluster head selection is done using RCSO. Then, the trust values of the cluster heads that are selected is computed to ensure security while routing. For the multipath routing, proposed Rider-ASO is developed by combining ASO and ROA. Thus, the proposed algorithm finds multiple secured paths from the source into destination based on selected CHs. The developed Rider-ASO outperformed other methods with minimal delay of 0.009 sec, maximal average residual energy 0.5494 J, maximal PDR of 97.82%, maximal throughput rate of 96.07%, respectively.

Average fidelity estimation of twirled noisy quantum channel using unitary 2 t -design

2019 ◽  
Vol 28 (1) ◽  
pp. 010304
Author(s):  
Linxi Zhang ◽  
Changhua Zhu ◽  
Changxing Pei
Keyword(s):  
Quantum Channel ◽  
Average Fidelity ◽  
Noisy Quantum Channel

QUANTUM COMMUNICATION VIA HEISENBERG XYZ SYSTEM

2013 ◽  
Vol 11 (03) ◽  
pp. 1350035 ◽  
Author(s):  
A. EL ALLATI ◽  
Y. HASSOUNI ◽  
N. METWALLY
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Quantum Communication ◽  
Average Fidelity ◽  
The Magnetic Field ◽  
Moriya Interaction ◽  
Degree Of Entanglement

The possibility of generating entangled network via Dzyaloshinskii–Moriya interaction is investigated. The entanglement between the different nodes is quantified. This entangled network is employed to send information between different users who are members on this network. The effect of the field strength and the magnetic field parameters on the degree of entanglement of the network and the average fidelity is discussed. We show that by controlling these parameters one can maximize the average fidelity of the teleported state.

Quantum teleportation via two-qubit Heisenberg XYZ chain

2014 ◽  
Vol 92 (5) ◽  
pp. 406-410 ◽  
Author(s):  
Nour Zidan
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Quantum Teleportation ◽  
Initial System ◽  
Entangled State ◽  
Initial State ◽  
Intrinsic Decoherence ◽  
Average Fidelity ◽  
Moriya Interaction

Quantum teleportation via the entanglement channel composed of a two-qubit Heisenberg XYZ chain with Dzyaloshinskii–Moriya interaction in the presence of both inhomogeneous external magnetic field and intrinsic decoherence has been investigated. It is shown that the initial state of the channel plays an important role in the fully entangled fraction and the average fidelity of teleportation. It is found that when the initial system is in the entangled state |Ψ⟩ = m2|01⟩ + n2|10⟩ the corresponding average fidelity is always larger than 2/3.

A Low-Cost Head Supported Eye Tracker with High Precision

2013 ◽  
Vol 772 ◽  
pp. 455-460
Author(s):  
Jie Chun Chen ◽  
Shi Quan Ma ◽  
Li Ping Zhao
Keyword(s):  
High Precision ◽  
Relative Position ◽  
Low Cost ◽  
Experimental Results ◽  
Average Error ◽  
Eye Tracker ◽  
Experimental Apparatus ◽  
The Subject ◽  
Maximal Average

This paper discusses a low cost head-supported eye tracker. To measure the coordinates associated with a subjects gaze point fallen on a monitor, the subject places his head on a head support and keeps his head fixed. Meanwhile, a camera is used to capture images of the subjects left or right eye. The subjects gaze point fallen on a monitor can be determined according to the relative position of the pupil and glint in an eye image. This paper presents not only the principle of this eye tracker, but also the methods used to detect the pupil and glint in an eye image. At last, this paper presents some experimental results, and the experimental results show that the maximal average error of the experimental apparatus is 15 pixels or 0.4 in degrees.

NOISE IN SWAPPING BETWEEN TWO PAIRS OF NON-ORTHOGONAL ENTANGLED COHERENT STATES

2012 ◽  
Vol 27 (03) ◽  
pp. 1350017 ◽  
Author(s):  
SHIVANI A. KUMAR ◽  
H. PRAKASH ◽  
N. CHANDRA ◽  
R. PRAKASH
Keyword(s):  
Coherent States ◽  
Low Noise ◽  
Average Fidelity ◽  
High Noise ◽  
Maximum Value ◽  
Entangled Coherent States ◽  
Suggested Modification

We consider a scheme of swapping between two pairs of non-orthogonal entangled coherent states with our suggested modification [H. Prakash, N. Chandra, R. Prakash and Shivani, Int. J. Mod. Phys. B 23(8) (2009) 2083] and discuss effect of decoherence on fidelity in swapping. We find that for odd photon counts, MAF (minimum of the fidelity for any arbitrary information) decreases with increase in |α|2 for low noise but in case of high noise, it increases, attains a maximum value and then decreases with |α|2. However, for nonzero even photon counts, the case is reversed. For this case, MAF decreases with increase in |α|2 for high noise but in case of low noise, it increases, attains a maximum value and then decreases with |α|2. We discuss the variation of average fidelity with |α|2 and show that it depends appreciably on the information for low values of |α|2 only.

S169 – Radiation-Associated Dysphagia with Nasopharyngeal Carcinoma

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P132-P133
Author(s):  
Jeremy D. Meier ◽  
Rebecca Leonard ◽  
D Gregory Farwell ◽  
Peter C Belafsky
Keyword(s):  
Nasopharyngeal Carcinoma ◽  
Average Duration ◽  
Clinical Database ◽  
Swallowing Function ◽  
Age And Gender ◽  
Swallowing Dysfunction ◽  
And Gender ◽  
Maximal Average ◽  
Pharyngeal Constriction ◽  
Normal Controls

Objectives We have observed that patients with dysphagia after radiotherapy (RT) for nasopharyngeal carcinoma (NPC) have substantially worse swallowing function than patients treated with RT of other sub-sites. The purpose of this investigation was to describe swallowing dysfunction after RT for NPC and compare swallowing parameters to patients receiving RT for cancer from another site. Methods Fluoroscopic swallowing data of persons with dysphagia after RT for NPC was abstracted from a clinical database. Objective swallowing parameters were compared to age- and gender-matched normal controls and to cancer stage-matched patients treated with RT for oropharyngeal cancer (OPC). Results 13 patients with NPC were compared to 13 controls and 13 patients with OPC. The average duration from RT to fluoroscopic study was 74 months for NPC and 24 months for OPC (p=.06). 62% of NPC and 47% of OPC were gastrostomy tube-dependent. 92% of NPC patients aspirated or penetrated compared to 62% of OPC patients. The maximal average tolerated bolus was 10.6cc for NPC and 22.2cc for OPC (p<.02). Mean hyolaryngeal elevation was 4.02 (±1.27) for normals, 2.96 (±0.86) for OPC, and 2.45 (± 1.17) for NPC (p<.01). Opening of the pharyngoesophageal segment was lower than normal in both NPC and OPC. Pharyngeal constriction was 0.08 (±0.09) for normals, 0.40 (±0.24) for OPC and 0.45 (±0.27) for NPC (p<.001). Conclusions The data suggest that patients with dysphagia after radiotherapy for NPC present at a later date, have significantly less hyolaryngeal elevation, have weaker pharyngeal constriction, and cannot tolerate as large a bolus as patients treated with radiotherapy for OPC.

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