scholarly journals Experimental protection of quantum coherence by using a phase-tunable image drive

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
S. Bertaina ◽  
H. Vezin ◽  
H. De Raedt ◽  
I. Chiorescu
Keyword(s):  
Quantum Information ◽  
Quantum Coherence ◽  
Quantum Information Processing ◽  
Quantum Computer ◽  
Operation Time ◽  
Spin Hamiltonians ◽  
Efficient Alternative ◽  
Processing And Storage ◽  
High Degree ◽  
And Storage

AbstractThe protection of quantum coherence is essential for building a practical quantum computer able to manipulate, store and read quantum information with a high degree of fidelity. Recently, it has been proposed to increase the operation time of a qubit by means of strong pulses to achieve a dynamical decoupling of the qubit from its environment. We propose and demonstrate a simple and highly efficient alternative route based on Floquet modes, which increases the Rabi decay time ($$T_R$$ T R ) in a number of materials with different spin Hamiltonians and environments. We demonstrate the regime $$T_R \approx T_1$$ T R ≈ T 1 with $$T_1$$ T 1 the relaxation time, thus providing a route for spin qubits and spin ensembles to be used in quantum information processing and storage.

Optical quantum information processing and storage

2018 ◽  
Author(s):  
Hisashi Ogawa ◽  
Takahiro Serikawa ◽  
Yu Shiozawa ◽  
Masanori Okada ◽  
Warit Asavanant ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Processing And Storage ◽  
And Storage

scholarly journals Morphology, Stability, and Application of Lycopene Microcapsules Produced by Complex Coacervation

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Glaucia A. Rocha-Selmi ◽  
Carmen S. Favaro-Trindade ◽  
Carlos R. F. Grosso
Keyword(s):  
Encapsulation Efficiency ◽  
Gum Arabic ◽  
Average Diameter ◽  
Stability Test ◽  
Free Form ◽  
Complex Coacervation ◽  
The Stability ◽  
Processing And Storage ◽  
High Degree ◽  
And Storage

The interest in lycopene has increased in recent years due to studies that associate it with the reduction in risk of developing cardiovascular diseases and cancer. However, due to its high degree of unsaturation, this carotenoid is inclined to isomerize and oxidize during processing and storage, making it difficult to use in the food industry. Microencapsulation can improve this situation, increasing its stability and making incorporation into food formulations possible. Thus, the aim of this study was to microencapsulate lycopene by complex coacervation using gelatin and gum Arabic as the encapsulating agents. The microcapsules were evaluated based on the encapsulation efficiency and their morphology and then submitted to a stability test and applied in cake making. Most of the systems studied presented spherical microcapsules with defined walls. The encapsulation efficiency values were above 90%, and the average diameter of the capsules ranged from 61 to 144 μm. The stability test showed that microencapsulation offered greater protection to the lycopene as compared to its free form. The application of nonfreeze dried coacervated microcapsules in cake making was satisfactory, but the color transference was low when freezedried coacervated microcapsules were used.

scholarly journals Quantum Computers - An Emerging Cybersecurity Threat

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Dajana Jelčić Dubček
Keyword(s):  
Information Processing ◽  
Quantum Coherence ◽  
Quantum Physics ◽  
Quantum Computers ◽  
Practical Implementation ◽  
Quantum Superposition ◽  
Processing And Storage ◽  
And Storage ◽  
Superposition Of States

Quantum computational supremacy may potentially endanger the current cryptographic protection methods. Although quantum computers are still far from a practical implementation in information processing and storage, they should not be overlooked in the context of cybersecurity. Quantum computers operate with qubits - units of information that are governed by the fundamental principles of quantum physics, such as quantum superposition of states and quantum coherence. In order to address the new challenge that quantum computers pose to cybersecurity, the very principles of their operation have to be understood and are overviewed in this contribution.

scholarly journals Amination of the Gd@C82 endohedral fullerene: tunable substitution effect on quantum coherence behaviors

2020 ◽  
Vol 11 (39) ◽  
pp. 10737-10743 ◽  
Author(s):  
Zheng Liu ◽  
Huan Huang ◽  
Ye-Xin Wang ◽  
Bo-Wei Dong ◽  
Bao-Yun Sun ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Coherence ◽  
Quantum Information Processing ◽  
Substitution Effect ◽  
Quantum Phase ◽  
Endohedral Fullerene ◽  
Memory Time ◽  
Phase Memory

Amination of the endohedral fullerene Gd@C82 exhibits enhanced quantum phase memory time and tunable substitution effect for quantum information processing.

scholarly journals Coherent preorder of quantum states

2020 ◽  
Vol 20 (13&14) ◽  
pp. 1124-1137
Author(s):  
Zhaofang Bai ◽  
Shuanping Shuanping Du
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Coherent States ◽  
Quantum Coherence ◽  
Quantum Information Processing ◽  
Quantum States ◽  
Mixed States ◽  
Quantum Hypothesis ◽  
Quantum Hypothesis Testing

As an important quantum resource, quantum coherence play key role in quantum information processing. It is often concerned with manipulation of families of quantum states rather than individual states in isolation. Given two pairs of coherent states $(\rho_1,\rho_2)$ and $(\sigma_1,\sigma_2)$, we are aimed to study how can we determine if there exists a strictly incoherent operation $\Phi$ such that $\Phi(\rho_i) =\sigma_i,i = 1,2$. This is also a classic question in quantum hypothesis testing. In this note, structural characterization of coherent preorder under strongly incoherent operations is provided. Basing on the characterization, we propose an approach to realize coherence distillation from rank-two mixed coherent states to $q$-level maximally coherent states. In addition, one scheme of coherence manipulation between rank-two mixed states is also presented.

Computational model underlying the one-way quantum computer

2002 ◽  
Vol 2 (6) ◽  
pp. 443-486
Author(s):  
R. Raussendorf ◽  
H. Briegel
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Computational Model ◽  
Quantum Logic ◽  
Quantum Information Processing ◽  
Quantum Computer ◽  
Quantum Circuit ◽  
Single Step ◽  
Clifford Group ◽  
The One

In this paper we present the computational model underlying the one-way quantum computer which we introduced recently [Phys. Rev. Lett. {\bf{86}}, 5188 (2001)]. The one-way quantum computer has the property that any quantum logic network can be simulated on it. Conversely, not all ways of quantum information processing that are possible with the one-way quantum computer can be understood properly in network model terms. We show that the logical depth is, for certain algorithms, lower than has so far been known for networks. For example, every quantum circuit in the Clifford group can be performed on the one-way quantum computer in a single step.

A palaeoethnobotanical study of the West House, Akrotiri, Thera

1992 ◽  
Vol 87 ◽  
pp. 219-230 ◽  
Author(s):  
Anaya Sarpaki
Keyword(s):  
Bronze Age ◽  
Complete Information ◽  
The West ◽  
Crop Processing ◽  
Plant Remains ◽  
Processing And Storage ◽  
A Site ◽  
High Degree ◽  
And Storage ◽  
Architectural Unit

This paper summarizes some results of palaeoethnobotanical study at Akrotiri, Thera, and evaluates the importance of studying plant remains at such a site. (As this is the first stage of a long programme, it does not pretend to be exhaustive.) The data from the West House provides the most detailed and complete information from Bronze Age Greece concerning bioarchaeological remains, because it comes from a single architectural unit (a completely excavated house). The results offer evidence for the crops grown, weeds of cultivation (segetal), and ruderal plants, as well as crop processing and storage. The data is important for its high taphonomic potential, thanks to the high degree of preservation of charred, mineralized, and silicified plant remains.

scholarly journals Quantum Mechanics and the Origin of Life

2004 ◽  
Vol 213 ◽  
pp. 237-244
Author(s):  
Paul Davies
Keyword(s):  
Quantum Mechanics ◽  
Information Processing ◽  
Quantum Information ◽  
Quantum Computation ◽  
Origin Of Life ◽  
Quantum Information Processing ◽  
Quantum Computer ◽  
The Origin Of Life ◽  
Concept Of Information

The race to build a quantum computer has led to a radical re-evaluation of the concept of information. In this paper I conjecture that life, defined as an information processing and replicating system, may be exploiting the considerable efficiency advantages offered by quantum computation, and that quantum information processing may dramatically shorten the odds for life originating from a random chemical soup. The plausibility of this conjecture rests, however, on life somehow circumventing the decoherence effects of the environment. I offer some speculations on ways in which this might happen.

Quantum information processing

2009 ◽  
Author(s):  
Stephen Barnett
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Unitary Transformation ◽  
Quantum Information Processing ◽  
Quantum Computer ◽  
Quantum Evolution ◽  
Quantum Computers ◽  
Digital Electronics ◽  
Logic Operations ◽  
And Control

We have seen how information can be encoded onto a quantum system by selecting the state in which it is prepared. Retrieving the information is achieved by performing a measurement, and the optimal measurement in any given situation is usually a generalized measurement. In between preparation and measurement, the information resides in the quantum state of the system, which evolves in a manner determined by the Hamiltonian. The associated unitary transformation may usefully be viewed as quantum information processing; if we can engineer an appropriate Hamiltonian then we can use the quantum evolution to assist in performing computational tasks. Our objective in quantum information processing is to implement a desired unitary transformation. Typically this will mean coupling together a number, perhaps a large number, of qubits and thereby generating highly entangled states. It is fortunate, although by no means obvious, that we can realize any desired multiqubit unitary transformation as a product of a small selection of simple transformations and, moreover, that each of these need only act on a single qubit or on a pair of qubits. The situation is reminiscent of digital electronics, in which logic operations are decomposed into actions on a small number of bits. If we can realize and control a very large number of such operations in a single device then we have a computer. Similar control of a large number of qubits will constitute a quantum computer. It is the revolutionary potential of quantum computers, more than any other single factor, that has fuelled the recent explosion of interest in our subject. We shall examine the remarkable properties of quantum computers in the next chapter. In digital electronics, we represent bit values by voltages: the logical value 1 is a high voltage (typically +5 V) and 0 is the ground voltage (0 V). The voltage bits are coupled and manipulated by transistor-based devices, or gates. The simplest gates act on only one bit or combine two bits to generate a single new bit, the value of which is determined by the two input bits. For a single bit, with value 0 or 1, the only possible operations are the identity (which does not require a gate) and the bit flip.

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