Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register

Photonic cluster states are a powerful resource for measurement-based quantum computing and loss-tolerant quantum communication. Proposals to generate multi-dimensional lattice cluster states have identified coupled spin-photon interfaces, spin-ancilla systems, and optical feedback mechanisms as potential schemes. Following these, we propose the generation of multi-dimensional lattice cluster states using a single, efficient spin-photon interface coupled strongly to a nuclear register. Our scheme makes use of the contact hyperfine interaction to enable universal quantum gates between the interface spin and a local nuclear register and funnels the resulting entanglement to photons via the spin-photon interface. Among several quantum emitters, we identify the silicon-29 vacancy centre in diamond, coupled to a nanophotonic structure, as possessing the right combination of optical quality and spin coherence for this scheme. We show numerically that using this system a 2×5-sized cluster state with a lower-bound fidelity of 0.5 and repetition rate of 65 kHz is achievable under currently realised experimental performances and with feasible technical overhead. Realistic gate improvements put 100-photon cluster states within experimental reach.

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Deterministic generation of a two-dimensional cluster state

Science ◽

10.1126/science.aay4354 ◽

2019 ◽

Vol 366 (6463) ◽

pp. 369-372 ◽

Cited By ~ 42

Author(s):

Mikkel V. Larsen ◽

Xueshi Guo ◽

Casper R. Breum ◽

Jonas S. Neergaard-Nielsen ◽

Ulrik L. Andersen

Keyword(s):

Quantum Computation ◽

Quantum Information Processing ◽

Fault Tolerant ◽

Cluster State ◽

Two Dimensional ◽

Cluster States ◽

Squeezed Light ◽

Universal Quantum ◽

Speed Up ◽

Quantum Error

Measurement-based quantum computation offers exponential computational speed-up through simple measurements on a large entangled cluster state. We propose and demonstrate a scalable scheme for the generation of photonic cluster states suitable for universal measurement-based quantum computation. We exploit temporal multiplexing of squeezed light modes, delay loops, and beam-splitter transformations to deterministically generate a cylindrical cluster state with a two-dimensional (2D) topological structure as required for universal quantum information processing. The generated state consists of more than 30,000 entangled modes arranged in a cylindrical lattice with 24 modes on the circumference, defining the input register, and a length of 1250 modes, defining the computation depth. Our demonstrated source of two-dimensional cluster states can be combined with quantum error correction to enable fault-tolerant quantum computation.

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Universal quantum computation with quantum-dot cellular automata in decoherence-free subspace

Quantum Information and Computation ◽

10.26421/qic8.10-7 ◽

2008 ◽

Vol 8 (10) ◽

pp. 977-985

Author(s):

Z.-Y. Xu ◽

M. Feng ◽

W.-M. Zhang

Keyword(s):

Cellular Automata ◽

Quantum Dot ◽

Quantum Computation ◽

Two Dimensions ◽

High Fidelity ◽

Electron Pairs ◽

Quantum Dot Cellular Automata ◽

Single Spin ◽

Universal Quantum ◽

Decoherence Free Subspace

We investigate the possibility to have electron-pairs in decoherence-free subspace (DFS), by means of the quantum-dot cellular automata (QCA) and single-spin rotations, to deterministically carry out a universal quantum computation with high-fidelity. We show that our QCA device with electrons tunneling in two dimensions is very suitable for DFS encoding, and argue that our design favors a scalable quantum computation robust to collective dephasing errors.

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A Split Scalp Study of Single versus Double Spin Platelet-rich plasma Injections in Treatment of Female Pattern Hair Loss: Clinical Effect and Relation to Vascular Endothelial Growth Factor in PRP

QJM ◽

10.1093/qjmed/hcab093.019 ◽

2021 ◽

Vol 114 (Supplement_1) ◽

Author(s):

Samar A Salem ◽

Rania M Elhusseiny ◽

Haitham M Saleh

Keyword(s):

Vascular Endothelial Growth Factor ◽

Hair Loss ◽

Platelet Rich Plasma ◽

Intradermal Injection ◽

Vascular Endothelial ◽

Single Spin ◽

Double Spin ◽

Female Pattern Hair Loss ◽

The Right ◽

Endothelial Growth Factor

Abstract Background Female pattern hair loss (FPHL) is the most common hair loss disorder in women. Platelet-rich plasma (PRP) provides an option for patients recalcitrant to the currently approved therapies. As there are many methods for the preparation of PRP, the most suitable for AGA therapy is not yet clear. Aims To compare the efficacy between single and double spin PRP injections in treatment of FPHL and to assess the relationship between the concentrations of vascular endothelial growth factor (VEGF) in the PRP preparation and the treatment results obtained. Patients and Methods 15 female patients with FPHL were enrolled. Each patient was subjected to intradermal injection of PRP (prepared by double-spin method) into the right half of the scalp, in addition to intradermal injection of PRP (prepared by singlespin method) into the left half of the scalp in the form of three treatment sessions three weeks apart. Evaluation of treatment response was done through comparing patients' global photographs, assessment of patients' satisfaction and folliscopic assessment before and after treatment. Results Our results showed clinically significant improvement by comparing patients' photographs in most of the treated patients. In addition, folliscopy revealed significant change of the terminal hair density in the right half of the scalp following treatment sessions.VEGF concentration didn't differ significantly between double-spin and single-spin prepared PRP, also it didn't differ significantly upon calcium activation. Conclusions PRP is an effective treatment modality for FPHL. Double-spin prepared PRP could yield better results in the treatment of FPHL than the single-spin method. However, adding Calcium gluconate prior to PRP injection is of no benefit as it didn't significantly increase the release of VEGF. Yet, further studies discussing different PRP preparation protocols and involving a larger number of cases are needed to minimize statistical errors and to detect the most accurate PRP preparation method with the greatest yield of growth factors.

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Coherent acoustic control of a single silicon vacancy spin in diamond

Nature Communications ◽

10.1038/s41467-019-13822-x ◽

2020 ◽

Vol 11 (1) ◽

Cited By ~ 19

Author(s):

Smarak Maity ◽

Linbo Shao ◽

Stefan Bogdanović ◽

Srujan Meesala ◽

Young-Ik Sohn ◽

...

Keyword(s):

Quantum Systems ◽

Phonon Coupling ◽

Single Spin ◽

Silicon Vacancy ◽

Acoustic Control ◽

State Point ◽

Hybrid Quantum Systems ◽

Universal Quantum ◽

Vacancy Center ◽

Strong Spin

AbstractPhonons are considered to be universal quantum transducers due to their ability to couple to a wide variety of quantum systems. Among these systems, solid-state point defect spins are known for being long-lived optically accessible quantum memories. Recently, it has been shown that inversion-symmetric defects in diamond, such as the negatively charged silicon vacancy center (SiV), feature spin qubits that are highly susceptible to strain. Here, we leverage this strain response to achieve coherent and low-power acoustic control of a single SiV spin, and perform acoustically driven Ramsey interferometry of a single spin. Our results demonstrate an efficient method of spin control for these systems, offering a path towards strong spin-phonon coupling and phonon-mediated hybrid quantum systems.

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Endoscopic incision of protruding right ureterocele in a single collecting system: a case report

Medical Journal of Indonesia ◽

10.13181/mji.v25i4.1352 ◽

2017 ◽

Vol 25 (4) ◽

pp. 240-44

Author(s):

Rinto Hariwibowo ◽

Harrina E. Rahardjo

Keyword(s):

External Genitalia ◽

Excretory Urography ◽

Voiding Cystourethrography ◽

System A ◽

Grade 5 ◽

Grade Ii ◽

The Right ◽

Collecting System ◽

Endoscopic Incision

Protruding ureterocele is a very rare case found in the literature. We are reporting a 21 year-old female with an intermittent protruding mass from urethra, accompanied by dysuria, hematuria, and recurrent urinary tract infection. Inspection of the external genitalia revealed a protruding mass from the urethra which could be reduced manually. Excretory urography showed bilateral single collecting systems, grade II hydronephrosis of the right kidney, and a cobra head appearance of the lower right pelvis. The patient was diagnosed with a protruding right ureterocele in a single collecting system, and thus, endoscopic incision of a ureterocele was performed. Ultrasonography which was carried out three weeks after the procedure confirmed no residual hydronephrosis or ureterocele in the bladder. Voiding cystourethrography (VCUG) underwent at a three-month-follow up revealed a grade 5 vesico-ureteral reflux (VUR) on the right side. Surgical reimplantation was then considered. In conclusion, endoscopic incision was safe and yielded good result for protruding ureteroceles, but the need for secondary surgery in several conditions should be considered.

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Three-center cluster states in 11C and 11B

Modern Physics Letters A ◽

10.1142/s0217732306022043 ◽

2006 ◽

Vol 21 (31n33) ◽

pp. 2403-2409

Author(s):

Yoshiko Kanada-En'yo

Keyword(s):

Experimental Data ◽

Molecular Dynamics ◽

Excited States ◽

Cluster State ◽

Cluster Structure ◽

Cluster States ◽

Spin Parity ◽

Variational Calculations

Structures of excited states in 11 C and 11 B were studied based on variational calculations after spin-parity projection in a framework of antisymmetrized molecular dynamics (AMD). The calculations systematically reproduce experimental data of the transition strengths such as Gamov-Teller(GT) and M1 transitions. A well-developed cluster structure of 2α+3 He (t) was found in the [Formula: see text] state of 11 C (11 B ). We assigned this state to the observed [Formula: see text] state at 8 MeV. The calculations reproduce the small [Formula: see text] which has been measured in the recent experiments. It was found that the [Formula: see text] state has a dilute cluster state, and its features are similar to those of the [Formula: see text] which is considered to be a gas state of three α clusters.

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Synchronization properties of spindle oscillations in a thalamic reticular nucleus model

Journal of Neurophysiology ◽

10.1152/jn.1994.72.3.1109 ◽

1994 ◽

Vol 72 (3) ◽

pp. 1109-1126 ◽

Cited By ~ 120

Author(s):

D. Golomb ◽

X. J. Wang ◽

J. Rinzel

Keyword(s):

Time Course ◽

Cluster State ◽

Large Population ◽

Reversal Potential ◽

Ionic Currents ◽

Thalamic Reticular Nucleus ◽

Reticular Nucleus ◽

Quiescent State ◽

Gamma Aminobutyric Acid ◽

Cluster States

1. We address the hypothesis of Steriade and colleagues that the thalamic reticular nucleus (RE) is a pacemaker for thalamocortical spindle oscillations by developing and analyzing a model of a large population of all-to-all coupled inhibitory RE neurons. 2. Each RE neuron has three ionic currents: a low-threshold T-type Ca2+ current (ICa-T), a calcium-activated potassium current (IAHP) and a leakage current (IL). ICa-T underlies a cell's postinhibitory rebound properties, whereas IAHP hyperpolarizes the neuron after a burst. Each neuron, which is a conditional oscillator, is coupled to all other RE neurons via fast gamma-aminobutyric acid-A (GABAA) and slow GABAB synapses. 3. For generating network oscillations IAHP may not be necessary. Synaptic inhibition can provide the hyperpolarization for deinactivating ICa-T that causes bursting if the reversal potentials for GABAA and GABAB synapses are sufficiently negative. 4. If model neurons display sufficiently powerful rebound excitability, an isolated RE network of such neurons oscillates with partial but typically not full synchrony. The neurons spontaneously segregate themselves into several macroscopic clusters. The neurons within a cluster follow the same time course, but the clusters oscillate differently from one another. In addition to activity patterns in which clusters burst sequentially (e.g., 2 or 3 clusters bursting alternately), a two-cluster state may occur with one cluster active and one quiescent. Because the neurons are all-to-all coupled, the cluster states do not have any spatial structure. 5. We have explored the sensitivity of such partially synchronized patterns to heterogeneity in cells' intrinsic properties and to simulated neuroelectric noise. Although either precludes precise clustering, modest levels of heterogeneity or noise lead to approximate clustering of active cells. The population-averaged voltage may oscillate almost regularly but individual cells burst at nearly every second cycle or less frequently. The active-quiescent state is not robust at all to heterogeneity or noise. Total asynchrony is observed when heterogeneity or noise is too large, e.g., even at 25% heterogeneity for our reference set of parameter values. 6. The fast GABAA inhibition (with a reversal potential more negative than, say, -65 mV) favors the cluster states and prevents full synchrony. Our simulation results suggest two mechanisms that can fully synchronize the isolated RE network model. With GABAA removed or almost totally blocked, GABAB inhibition (because it is slow) can lead to full synchrony, which is partially robust to heterogeneity and noise.(ABSTRACT TRUNCATED AT 400 WORDS)

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Teleportation of an Unknown Four-Qubit Cluster State Based on Cluster States With Minimum Resource

IEEE Access ◽

10.1109/access.2020.2991065 ◽

2020 ◽

Vol 8 ◽

pp. 81447-81457

Author(s):

Ling-Yun Cao ◽

Shi-Bei Xue ◽

Min Jiang

Keyword(s):

Cluster State ◽

Cluster States

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An efficient controlled quantum secure direct communication and authentication by using four particle cluster states

International Journal of Quantum Information ◽

10.1142/s0219749917500022 ◽

2017 ◽

Vol 15 (01) ◽

pp. 1750002 ◽

Cited By ~ 6

Author(s):

Milad Nanvakenari ◽

Monireh Houshmand

Keyword(s):

Cluster State ◽

Quantum Secure Direct Communication ◽

Identity Authentication ◽

Secret Message ◽

Particle Cluster ◽

Cluster States ◽

Present Scheme ◽

Direct Communication ◽

Eavesdropping Detection ◽

Base Identity

In this paper, a three-party controlled quantum secure direct communication and authentication (QSDCA) protocol is proposed by using four particle cluster states via a quantum one-time pad and local unitary operations. In the present scheme, only under the permission of the controller, the sender and the receiver can implement secure direct communication successfully. But under any circumstances, Charlie cannot obtain the secret message. Eavesdropping detection and identity authentication are achieved with the help of the previously shared reusable base identity strings of users. This protocol is unconditionally secure in both ideal and practical noisy cases. In one transmission, a qubit of each four particle cluster state is used as controller’s permission and the same qubit with another qubit are used to recover two classical bits of information. In the proposed scheme, the efficiency is improved compared with the previous works.

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