Quantum Information Processing

We calculate the energy levels of a system of neutrinos undergoing collective oscillations as functions of an effective coupling strength and radial distance from the neutrino source using the quantum Lanczos (QLanczos) algorithm implemented on ...

The solution of linear systems of equations is a very frequent operation and thus important in many fields. The complexity using classical methods increases linearly with the size of equations. The HHL algorithm proposed by Harrow et al. achieves ...$\left|\right.〉$

In a recent paper (Ma, Int J Theor Phys 59: 1844–1853, 2020), a multiparty quantum state sharing protocol based on entanglement swapping of Bell states was presented. However, as we show, when the number of agents is more than three, this protocol ...

Tensor network states, in which tensor networks are used to encode the coefficients of a state wavefunction, have been proposed for the study of quantum many-body systems. The most common tensor network state is matrix product state (MPS). ...

Quantum devices can be used to solve constrained combinatorial optimization (COPT) problems thanks to the use of penalization methods to embed the COPT problem’s constraints in its objective to obtain a quadratic unconstrained binary optimization (...

We have applied the “minimal” quantization scheme to investigate the quantization of the classical Stackelberg oligopoly. In particular, we have examined how the quantum entanglement affects the first-mover advantage in the Stackelberg game. It is ...

In this paper, we propose a quantum algorithm to efficiently perform locality preserving projection (LPP) for dimensionality reduction, named quantum locality preserving projection (QLPP). We present QLPP in 4 steps and give their corresponding ...${}_{\mathrm{}}^{\mathrm{}}\sqrt{}\mathrm{}{}^{\mathrm{}}$$$${}_{\mathrm{}}$$$${}^{\mathrm{}}$

In this paper, we study a class of special hypergraph access structures. According to this structure, we construct a group of orthogonal multipartite entangled states in n-dimensional system and investigate the distinguishability of these ...

We present a device-independent quantum bit-wise XOR summation protocol based on a pseudo-telepathy multi-partite GHZ game proposed by Brassard et al. In this game, n participants can win the game with certainty with a quantum strategy, but using ...

A two-qubit Heisenberg XYZ model with Dzyaloshinsky–Moriya (DM) and Kaplan–Shekhtman–Entin-Wohlman–Aharony (KSEA) interactions is considered at thermal equilibrium. Analytical formulas are derived for the local quantum uncertainty (LQU) and local ...

Using the unique entanglement and measurement properties of four-particle GHZ states, we systematically analyze two four-particle GHZ states, three four-particle GHZ states, and four four-particle GHZ states exchanging one or two groups of ...

In the realm of quantum machine learning, different genres of quantum classifiers have been designed to classify classical data. Recently, a quantum classifier that features re-uploading the sample to be classified many times along the quantum ...

A user who does not have a quantum computer but wants to perform quantum computations may delegate his/her computation to a quantum cloud server. For users securely using the service, it must be assured that no malicious server can access any ...

We develop a method to quantify the superposition state of two different Laguerre–Gaussian modes. By analyzing the characteristics of the intensity distribution obtained in a single measurement, including the petal number, the position and value ...

Deep neural networks (DNN) can be applied at the post-processing stage for the improvement of the results of quantum computations on noisy intermediate-scale quantum (NISQ) processors. Here, we propose a method based on this idea, which is most ...

It is not easy to compute the entanglement of multipartite pure or mixed states, because it usually involves complex optimization. In this paper, we are devoted to the geometric measure of entanglement of multipartite pure or mixed state by the ...

A probability amplitude-encoded multichannel representation for quantum audio signals (or simply PMQA) is proposed in this study. As an entangled state, PMQA requires only one qubit to epitomise the bipolar decimal amplitude values of a quantum ...

Classical, i.e., non-quantum, communications include configurations with multiple-input multiple-output (MIMO) channels. Some associated signal processing tasks consider these channels in a symmetric way, i.e., by assigning the same role to all ...

By recursive construction and computer-supported search method, the spectrum of quantum caps in projective space $PG(k,9)(k\ge 2)$ is determined. Through Hermitian construction, the obtained quantum caps are used to construct ternary quantum codes of $d=...\mathrm{}$$\mathrm{}$$\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}$

We study steady-state three bipartite entanglements in a cavity magnomechanical system which is composed of magnon, two cavities, and mechanical resonator. The two cavities are connected by an optical fiber, one of cavities couples to the magnon ...

We study the dynamics of classical and quantum correlations between two edge spins in a zigzag graphene nanoribbon (ZGNR) under noisy channels including the bit flip, phase flip, and bit–phase flip channels. The results show that the classical ...

Dynamical aspects of information-theoretic and entropic measures of quantum systems are studied. First, we show that for the time-dependent harmonic oscillator, as well as for the charged particle in certain time-varying electromagnetic fields, ...

With the rapid growth of qubit numbers and coherence times in quantum hardware technology, implementing shallow neural networks on the so-called Noisy Intermediate-Scale Quantum (NISQ) devices has attracted a lot of interest. Many quantum (...

Entanglement-assisted quantum error-correcting codes (EAQECCs) are a generalization of standard stabilizer quantum error-correcting codes, which can be possibly constructed from any classical codes by relaxing the duality condition and utilizing ...

Utilizing the advantage of decoherence-free (DF) states, two semi-quantum private comparison (SQPC) protocols against the collective-dephasing noise and collective-rotation noise are proposed, respectively. In the protocols, two semi-quantum ...

We propose a W state-based protocol for anonymously transmitting quantum messages in a quantum network. Different from the existing protocols [A. Unnikrishnan, et al., Phys. Rev. Lett. 122, 240501 (2019)], the proposed protocol can be effectively ...

Different from traditional digital signatures, quantum blind signatures can implement a signature without knowing the specific content, and their security is guaranteed by the basic principles of quantum mechanics with unconditional security. ...

Fusing the ideas of bidirectional hybrid controlled quantum communication and quantum network coding, we put forward a protocol for implementing butterfly network coding by using a five-qubit Brown state as the quantum channel. It shows that each ...

Information about an unknown quantum state can be encoded in weak values of projectors belonging to a complete eigenbasis. A protocol that enables one party—Bob—to remotely determine the weak values corresponding to weak measurements performed by ...

In this paper, we present a theoretical analysis on the study of quantum memory (QM) parameters in a three-level $\mathrm{\Lambda }$-configuration in the presence of Laguerre–Gaussian (LG) beam for Rubidium-87 and Cesium-133 alkali species in ultracold two-...${}_{}$$\mathrm{}{}_{}$${}_{}\mathrm{}{}^{\mathrm{}}$