Universal quantum gates between nitrogen-vacancy centers in a levitated nanodiamond

We propose a scheme to realize universal quantum gates between nitrogen-vacancy (NV) centers in an optically trapped nanodiamond, through uniform magnetic field induced coupling between the NV centers and the torsional mode of the levitated nanodiamond. The gates are tolerant to the thermal noise of the torsional mode. By combining the scheme with dynamical decoupling technology, it is found that the high fidelity quantum gates are possible for the present experimental conditions. The proposed scheme is useful for NV-center-based quantum network and distributed quantum computationComment: 7 pages, 6 figure

Distributed Machine Learning Architecture for Security Improvement in Computer Drafting and Writing in Art Asset Identification System

Art asset identification service is becoming increasingly important in the art market, where the value of art assets is constantly changing. The service provides authentication, evaluation, and provenance research for artworks, which helps art collectors and institutions to protect their investments and ensure the authenticity of their collections. The effective management of big data is critical for the art asset identification service, and there are several big data management technologies that can be achieved. To improve security in the big data Management model uses Distributed Associative Rule Mining is implemented with Hashing based Symmetric Key Cryptography. The designed model comprises of Associate Rule Hashing Symmetric Key (ARHSK). The proposed ARHSK model comprises the symmetric key generated with the hashing model to secure art assets. With the ARHSK information is stored and processed for security features. The performance of the ARHSK model is implemented with the machine learning model for classification. Simulation analysis expressed that ARHSK exhibits an improved classification accuracy of 99.67% which is ~13% higher than the CNN and ANN models

Nonadiabatic dynamics and geometric phase of an ultrafast rotating electron spin

The spin in a rotating frame has attracted a lot of attentions recently, as it deeply relates to both fundamental physics such as pseudo-magnetic field and geometric phase, and applications such as gyroscopic sensors. However, previous studies only focused on adiabatic limit, where the rotating frequency is much smaller than the spin frequency. Here we propose to use a levitated nano-diamond with a built-in nitrogen-vacancy (NV) center to study the dynamics and the geometric phase of a rotating electron spin without adiabatic approximation. We find that the transition between the spin levels appears when the rotating frequency is comparable to the spin frequency at zero magnetic field. Then we use Floquet theory to numerically solve the spin energy spectrum, study the spin dynamics and calculate the geometric phase under a finite magnetic field, where the rotating frequency to fulfill the resonant transition condition could be greatly reduced.Comment: 6+2 pages, 3+1 figure

A Nation Going Under: Legal Protection for “Climate Change Refugees”

Climate change-related disasters displace millions of people each year. Small island states in the Pacific have become emblematic of the problem because they are among the most impacted and the most vulnerable. Often portrayed by global media as drowning beneath the sea, these states are struggling for their very survival. Many of their residents are looking to move overseas, but face a lack of legal options to migrate. A test case in New Zealand from a Kiribati national claiming to be a “climate change refugee” highlights the difficulty of fitting climate-induced migrants into the Refugee Convention mold. To grant refuge, deemed the persecutor, would have turned the refugee paradigm on its head. This case reveals the wide protection gap left by existing domestic and international laws for those hoping to flee their sinking homes. To fill this gap, it will be essential for domestic, regional, and multilateral bodies to proactively work together in developing and implementing effective strategies for migration

The Buck Stops Here: Fundamental Rights Infringements Can No Longer Be Ignored When Transferring Asylum Seekers Under \u3cem\u3eDublin II\u3c/em\u3e

Many asylum seekers entering the European Union (EU) cross more than one Member State border before lodging their asylum claims. In response, the EU adopted Dublin II to designate the point of first entry, rather than the point of application, as the State responsible for examining the claim. Unfortunately, this allocation of examination responsibilities overburdens States on the frontline of entry, such as Greece, and has exacerbated the systemic deficiencies in these states’ asylum systems. The Court of Justice of the European Union’s decision in the Joined Cases C-411/10 & C-493/10 helped clarify that a receiving state cannot transfer asylum seekers to the responsible state if they would be subjected to inhumane treatment there. Although this decision halted Dublin II transfers to states where fundamental rights risked being violated, the EU continues to struggle with an unbalanced distribution of asylum claims. Until the principle of solidarity is put into practice and more claims are shifted to lesser-burdened states, the EU will not meet its goal of creating a fair and effective Common European Asylum Policy