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https://www.readbyqxmd.com/read/27924865/quantum-error-correction-protects-quantum-search-algorithms-against-decoherence
#1
Panagiotis Botsinis, Zunaira Babar, Dimitrios Alanis, Daryus Chandra, Hung Nguyen, Soon Xin Ng, Lajos Hanzo
When quantum computing becomes a wide-spread commercial reality, Quantum Search Algorithms (QSA) and especially Grover's QSA will inevitably be one of their main applications, constituting their cornerstone. Most of the literature assumes that the quantum circuits are free from decoherence. Practically, decoherence will remain unavoidable as is the Gaussian noise of classic circuits imposed by the Brownian motion of electrons, hence it may have to be mitigated. In this contribution, we investigate the effect of quantum noise on the performance of QSAs, in terms of their success probability as a function of the database size to be searched, when decoherence is modelled by depolarizing channels' deleterious effects imposed on the quantum gates...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27870417/gender-differences-in-neural-correlates-of-stress-induced-anxiety
#2
Dongju Seo, Aneesha Ahluwalia, Marc N Potenza, Rajita Sinha
Although gender differences have been identified as a crucial factor for understanding stress-related anxiety and associated clinical disorders, the neural mechanisms underlying these differences remain unclear. To explore gender differences in the neural correlates of stress-induced anxiety, the current study used functional magnetic resonance imaging to examine brain responses in 96 healthy men and women with commensurable levels of trait anxiety as they engaged in a personalized guided imagery paradigm to provoke stress and neutral-relaxing experiences...
January 2, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/27852770/environmental-anchoring-of-head-direction-in-a-computational-model-of-retrosplenial-cortex
#3
Andrej Bicanski, Neil Burgess
: Allocentric (world-centered) spatial codes driven by path integration accumulate error unless reset by environmental sensory inputs that are necessarily egocentric (body-centered). Previous models of the head direction system avoided the necessary transformation between egocentric and allocentric reference frames by placing visual cues at infinity. Here we present a model of head direction coding that copes with exclusively proximal cues by making use of a conjunctive representation of head direction and location in retrosplenial cortex...
November 16, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27824337/3-dimensional-electron-microscopic-imaging-of-the-zebrafish-olfactory-bulb-and-dense-reconstruction-of-neurons
#4
Adrian A Wanner, Christel Genoud, Rainer W Friedrich
Large-scale reconstructions of neuronal populations are critical for structural analyses of neuronal cell types and circuits. Dense reconstructions of neurons from image data require ultrastructural resolution throughout large volumes, which can be achieved by automated volumetric electron microscopy (EM) techniques. We used serial block face scanning EM (SBEM) and conductive sample embedding to acquire an image stack from an olfactory bulb (OB) of a zebrafish larva at a voxel resolution of 9.25×9.25×25 nm(3)...
November 8, 2016: Scientific Data
https://www.readbyqxmd.com/read/27715126/continuous-quantum-nondemolition-measurement-of-the-transverse-component-of-a-qubit
#5
U Vool, S Shankar, S O Mundhada, N Ofek, A Narla, K Sliwa, E Zalys-Geller, Y Liu, L Frunzio, R J Schoelkopf, S M Girvin, M H Devoret
Quantum jumps of a qubit are usually observed between its energy eigenstates, also known as its longitudinal pseudospin component. Is it possible, instead, to observe quantum jumps between the transverse superpositions of these eigenstates? We answer positively by presenting the first continuous quantum nondemolition measurement of the transverse component of an individual qubit. In a circuit QED system irradiated by two pump tones, we engineer an effective Hamiltonian whose eigenstates are the transverse qubit states, and a dispersive measurement of the corresponding operator...
September 23, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27689257/noise-threshold-and-resource-cost-of-fault-tolerant-quantum-computing-with-majorana-fermions-in-hybrid-systems
#6
Ying Li
Fault-tolerant quantum computing in systems composed of both Majorana fermions and topologically unprotected quantum systems, e.g., superconducting circuits or quantum dots, is studied in this Letter. Errors caused by topologically unprotected quantum systems need to be corrected with error-correction schemes, for instance, the surface code. We find that the error-correction performance of such a hybrid topological quantum computer is not superior to a normal quantum computer unless the topological charge of Majorana fermions is insusceptible to noise...
September 16, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27671349/a-soft-decoding-algorithm-and-hardware-implementation-for-the-visual-prosthesis-based-on-high-order-soft-demodulation
#7
Yuan Yang, Nannan Quan, Jingjing Bu, Xueping Li, Ningmei Yu
BACKGROUND: High order modulation and demodulation technology can solve the frequency requirement between the wireless energy transmission and data communication. In order to achieve reliable wireless data communication based on high order modulation technology for visual prosthesis, this work proposed a Reed-Solomon (RS) error correcting code (ECC) circuit on the basis of differential amplitude and phase shift keying (DAPSK) soft demodulation. Firstly, recognizing the weakness of the traditional DAPSK soft demodulation algorithm based on division that is complex for hardware implementation, an improved phase soft demodulation algorithm for visual prosthesis to reduce the hardware complexity is put forward...
September 26, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/27663946/withdrawn-depressed-behaviors-and-error-related-brain-activity-in-youth-with-obsessive-compulsive-disorder
#8
Gregory L Hanna, Yanni Liu, Yona E Isaacs, Angela M Ayoub, Jose J Torres, Nolan B O'Hara, William J Gehring
OBJECTIVE: The pathophysiology of obsessive-compulsive disorder (OCD) involves increased activity in corticostriatal circuits connecting the anterior cingulate cortex with other brain regions. The error-related negativity (ERN) is a negative deflection in the event-related potential after an incorrect response that is believed to reflect anterior cingulate cortex activity. This study examined the relation of the ERN to OCD symptom dimensions and other childhood symptom dimensions. METHOD: The ERN, correct response negativity, and accuracy were measured during a flanker task to assess performance monitoring in 80 youth with a lifetime diagnosis of OCD and 80 matched healthy comparison participants ranging from 8 to 18 years old...
October 2016: Journal of the American Academy of Child and Adolescent Psychiatry
https://www.readbyqxmd.com/read/27551824/conflict-resolution-as-near-threshold-decision-making-a-spiking-neural-circuit-model-with-two-stage-competition-for-antisaccadic-task
#9
Chung-Chuan Lo, Xiao-Jing Wang
Automatic responses enable us to react quickly and effortlessly, but they often need to be inhibited so that an alternative, voluntary action can take place. To investigate the brain mechanism of controlled behavior, we investigated a biologically-based network model of spiking neurons for inhibitory control. In contrast to a simple race between pro- versus anti-response, our model incorporates a sensorimotor remapping module, and an action-selection module endowed with a "Stop" process through tonic inhibition...
August 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27539299/determination-and-compensation-of-series-resistances-during-whole-cell-patch-clamp-recordings-using-an-active-bridge-circuit-and-the-phase-sensitive-technique
#10
Therese Riedemann, Hans Reiner Polder, Bernd Sutor
We present a technique which combines two methods in order to measure the series resistance (R S) during whole-cell patch-clamp recordings from excitable and non-excitable cells. R S is determined in the amplifier's current-clamp mode by means of an active bridge circuit. The correct neutralization of the electrode capacitance and the adjustment of the bridge circuit is achieved by the so-called phase-sensitive method: Short sine wave currents with frequencies between 3 and 7 kHz are injected into the cells...
October 2016: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/27472103/secret-sharing-of-a-quantum-state
#11
He Lu, Zhen Zhang, Luo-Kan Chen, Zheng-Da Li, Chang Liu, Li Li, Nai-Le Liu, Xiongfeng Ma, Yu-Ao Chen, Jian-Wei Pan
Secret sharing of a quantum state, or quantum secret sharing, in which a dealer wants to share a certain amount of quantum information with a few players, has wide applications in quantum information. The critical criterion in a threshold secret sharing scheme is confidentiality: with less than the designated number of players, no information can be recovered. Furthermore, in a quantum scenario, one additional critical criterion exists: the capability of sharing entangled and unknown quantum information. Here, by employing a six-photon entangled state, we demonstrate a quantum threshold scheme, where the shared quantum secrecy can be efficiently reconstructed with a state fidelity as high as 93%...
July 15, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27437573/extending-the-lifetime-of-a-quantum-bit-with-error-correction-in-superconducting-circuits
#12
Nissim Ofek, Andrei Petrenko, Reinier Heeres, Philip Reinhold, Zaki Leghtas, Brian Vlastakis, Yehan Liu, Luigi Frunzio, S M Girvin, L Jiang, Mazyar Mirrahimi, M H Devoret, R J Schoelkopf
Quantum error correction (QEC) can overcome the errors experienced by qubits and is therefore an essential component of a future quantum computer. To implement QEC, a qubit is redundantly encoded in a higher-dimensional space using quantum states with carefully tailored symmetry properties. Projective measurements of these parity-type observables provide error syndrome information, with which errors can be corrected via simple operations. The 'break-even' point of QEC--at which the lifetime of a qubit exceeds the lifetime of the constituents of the system--has so far remained out of reach...
August 25, 2016: Nature
https://www.readbyqxmd.com/read/27330894/asic-based-design-of-nmr-system-health-monitor-for-mission-safety-critical-applications
#13
P Balasubramanian
N-modular redundancy (NMR) is a generic fault tolerance scheme that is widely used in safety-critical circuit/system designs to guarantee the correct operation with enhanced reliability. In passive NMR, at least a majority (N + 1)/2 out of N function modules is expected to operate correctly at any time, where N is odd. Apart from a conventional realization of the NMR system, it would be useful to provide a concurrent indication of the system's health so that an appropriate remedial action may be initiated depending upon an application's safety criticality...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27279216/digitized-adiabatic-quantum-computing-with-a-superconducting-circuit
#14
R Barends, A Shabani, L Lamata, J Kelly, A Mezzacapo, U Las Heras, R Babbush, A G Fowler, B Campbell, Yu Chen, Z Chen, B Chiaro, A Dunsworth, E Jeffrey, E Lucero, A Megrant, J Y Mutus, M Neeley, C Neill, P J J O'Malley, C Quintana, P Roushan, D Sank, A Vainsencher, J Wenner, T C White, E Solano, H Neven, John M Martinis
Quantum mechanics can help to solve complex problems in physics and chemistry, provided they can be programmed in a physical device. In adiabatic quantum computing, a system is slowly evolved from the ground state of a simple initial Hamiltonian to a final Hamiltonian that encodes a computational problem. The appeal of this approach lies in the combination of simplicity and generality; in principle, any problem can be encoded. In practice, applications are restricted by limited connectivity, available interactions and noise...
June 9, 2016: Nature
https://www.readbyqxmd.com/read/27240809/movement-disorders-following-cerebrovascular-lesions-in-cerebellar-circuits
#15
REVIEW
Seong-Min Choi
Cerebellar circuitry is important to controlling and modifying motor activity. It conducts the coordination and correction of errors in muscle contractions during active movements. Therefore, cerebrovascular lesions of the cerebellum or its pathways can cause diverse movement disorders, such as action tremor, Holmes' tremor, palatal tremor, asterixis, and dystonia. The pathophysiology of abnormal movements after stroke remains poorly understood. However, due to the current advances in functional neuroimaging, it has recently been described as changes in functional brain networks...
May 2016: Journal of Movement Disorders
https://www.readbyqxmd.com/read/27128344/quorum-sensing-synchronization-of-synthetic-toggle-switches-a-design-based-on-monotone-dynamical-systems-theory
#16
Evgeni V Nikolaev, Eduardo D Sontag
Synthetic constructs in biotechnology, biocomputing, and modern gene therapy interventions are often based on plasmids or transfected circuits which implement some form of "on-off" switch. For example, the expression of a protein used for therapeutic purposes might be triggered by the recognition of a specific combination of inducers (e.g., antigens), and memory of this event should be maintained across a cell population until a specific stimulus commands a coordinated shut-off. The robustness of such a design is hampered by molecular ("intrinsic") or environmental ("extrinsic") noise, which may lead to spontaneous changes of state in a subset of the population and is reflected in the bimodality of protein expression, as measured for example using flow cytometry...
April 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27127945/hardware-efficient-and-fully-autonomous-quantum-error-correction-in-superconducting-circuits
#17
Eliot Kapit
Superconducting qubits are among the most promising platforms for building a quantum computer. However, individual qubit coherence times are not far past the scalability threshold for quantum error correction, meaning that millions of physical devices would be required to construct a useful quantum computer. Consequently, further increases in coherence time are very desirable. In this Letter, we blueprint a simple circuit consisting of two transmon qubits and two additional lossy qubits or resonators, which is passively protected against all single-qubit quantum error channels through a combination of continuous driving and engineered dissipation...
April 15, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27070616/mechanical-coupling-error-suppression-technology-for-an-improved-decoupled-dual-mass-micro-gyroscope
#18
Bo Yang, Xingjun Wang, Yunpeng Deng, Di Hu
This paper presents technology for the suppression of the mechanical coupling errors for an improved decoupled dual-mass micro-gyroscope (DDMG). The improved micro-gyroscope structure decreases the moment arm of the drive decoupled torque, which benefits the suppression of the non-ideal decoupled error. Quadrature correction electrodes are added to eliminate the residual quadrature error. The structure principle and the quadrature error suppression means of the DDMG are described in detail. ANSYS software is used to simulate the micro-gyroscope structure to verify the mechanical coupling error suppression effect...
2016: Sensors
https://www.readbyqxmd.com/read/27000308/altered-response-preparation-in-patients-with-adult-adhd-a-high-density-erp-study
#19
Brigitta Kakuszi, László Tombor, Szilvia Papp, István Bitter, Pál Czobor
Aberrations in early-developing bottom-up processes, such as stimulus-driven response preparation, are thought to play a critical role in the onset of ADHD, and in its persistence over time. Electrophysiology offers a unique tool to gain insight into response preparation, since response preparation has been associated with distinctive ERP changes, including negative potential-shifts which occur predominantly over frontal brain areas. We examined response-preceding negative potential shifts (RPNS) as a probe of response-preparation in adult ADHD patients by obtaining high-density event-related potentials from 33 ADHD and 29 matched healthy subjects during a Go/Nogo task using a 128-channel BioSemi recording-system...
March 30, 2016: Psychiatry Research
https://www.readbyqxmd.com/read/26892846/relationship-between-white-matter-integrity-and-serum-cortisol-levels-in-drug-naive-patients-with-major-depressive-disorder-diffusion-tensor-imaging-study-using-tract-based-spatial-statistics
#20
Xiaodan Liu, Keita Watanabe, Shingo Kakeda, Reiji Yoshimura, Osamu Abe, Satoru Ide, Kenji Hayashi, Asuka Katsuki, Wakako Umene-Nakano, Rieko Watanabe, Issei Ueda, Jun Nakamura, Yukunori Korogi
BACKGROUND: Higher daytime cortisol levels because of a hyperactive hypothalamic-pituitary-adrenal axis have been reported in patients with major depressive disorder (MDD). The elevated glucocorticoids inhibit the proliferation of the oligodendrocytes that are responsible for myelinating the axons of white matter fibre tracts. AIMS: To evaluate the relationship between white matter integrity and serum cortisol levels during a first depressive episode in drug-naive patients with MDD (MDD group) using a tract-based spatial statistics (TBSS) method...
June 2016: British Journal of Psychiatry: the Journal of Mental Science
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