排序方式: 共有78条查询结果,搜索用时 15 毫秒
1.
Advanced Encryption Standard (AES) is one of the most widely used block ciphers nowadays, and has been established as an encryption standard in 2001. Here we design AES-128 and the sample-AES (S-AES) quantum circuits for deciphering. In the quantum circuit of AES-128, we perform an affine transformation for the SubBytes part to solve the problem that the initial state of the output qubits in SubBytes is not the |0>⊗8 state. After that, we are able to encode the new round sub-key on the qubits encoding the previous round sub-key, and this improvement reduces the number of qubits used by 224 compared with Langenberg et al.’s implementation. For S-AES, a complete quantum circuit is presented with only 48 qubits, which is already within the reach of existing noisy intermediate-scale quantum computers. 相似文献
2.
Gui-Lu Long 《中国科学:物理学 力学 天文学(英文版)》2019,(11)
<正>In terms of mass, carbon is the fourth most abundant element in the universe after hydrogen, helium, and oxygen, and the second most abundant element in the human body (approximately 18.5%) after oxygen. Carbon’s formation from helium is an essential gateway in stellar nucleosynthesis, which is responsible for the galactic abundance of elements ranging from carbon to 相似文献
3.
4.
We propose and analyze an efficient high-dimensional quantum state transfer protocol in an XX coupling spin network with a hypercube structure or chain structure. Under free spin wave approximation, unitary evolution results in a perfect high-dimensional quantum swap operation requiring neither external manipulation nor weak coupling. Evolution time is independent of either distance between registers or dimensions of sent states, which can improve the computational efficiency. In the low temperature regime and thermodynamic limit, the decoherence caused by a noisy environment is studied with a model of an antiferromagnetic spin bath coupled to quantum channels via an Ising-type interaction. It is found that while the decoherence reduces the fidelity of state transfer, increasing intra-channel coupling can strongly suppress such an effect. These observations demonstrate the robustness of the proposed scheme. 相似文献
5.
Science China Physics, Mechanics & Astronomy - Active galactic nuclei (AGNs) have been attracting research attention due to their special observable properties. Specifically, a majority of AGNs... 相似文献
6.
WANG Chuan LI Yan-Song LONG Gui-Lu 《理论物理通讯》2006,46(3):440-442
In this paper, a quantum secure direct communication protocol using ensembles with the same density matrix is proposed. The two communication parties can realize the message transmission using this method through a quantum channel, each bit of information can be transmitted using an ensemble and read out through global measurement. The eavesdropping behavior can be detected through the channel diagnoses. 相似文献
7.
Creation of Entanglement with Nonlocal Operations 总被引:5,自引:0,他引:5
ZHANG Yong CAO Wan-Cang LONG Gui-Lu 《理论物理通讯》2005,44(4):625-630
We discuss how to create more entanglement with nonlocal operations acting on two-particle states. For a given nonlocal operation, we find that some input states cannot produce entanglement and some produce the maximal entanglement, and find that any initial entangled states can produce more entanglement than initial product states. 相似文献
8.
The angular-momentum projection part of RECAPS is presented.
Application of RECAPS to some deformed nuclei is also
presented. 相似文献
9.
Ground-state entanglement in a three-spin transverse Ising model with energy current 总被引:2,自引:0,他引:2 下载免费PDF全文
The ground-state entanglement associated with a three-spin
transverse Ising model is studied. By introducing an energy
current into the system, a quantum phase transition to
energy-current phase may be presented with the variation of
external magnetic field; and the ground-state entanglement
varies suddenly at the critical point of quantum phase
transition. In our model, the introduction of energy current
makes the entanglement between any two qubits become maximally
robust. 相似文献
10.
CHENBo MAYing-Jun LONGGui-Lu 《理论物理通讯》2003,40(6):655-658
We study a quantum game played by two players with restricted multiple strategies. It is found that in this restricted quantum game Nash equilibrium does not always exist when the initial state is entangled. At the same time,we find that when Nasli equilibrium exists the payoff function is usually different from that in the classical counterpart except in some special cases. This presents an explicit example showing quantum game and classical game may differ.When designing a quantum game with limited strategies, the allowed strategy should be carefully chosen according to the type of initial state. 相似文献