#### Filter Results:

- Full text PDF available (16)

#### Publication Year

1994

2008

- This year (0)
- Last 5 years (0)
- Last 10 years (2)

#### Publication Type

#### Co-author

#### Journals and Conferences

Learn More

- Hiroo Azuma, Satoshi Iso
- 1994

Explicit relation between Laughlin state of the quantum Hall effect and onedimensional(1D) model with long-ranged interaction (1/r) is discussed. By rewriting lowest Landau level wave functions in terms of 1D representation, Laughlin state can be written as a deformation of the ground state of Calogero-Sutherland model. Corresponding to Laughlin state on… (More)

- Hiroo Azuma
- 2000

We discuss how to build some partially entangled states of n two-state quantum systems (qubits). The optimal partially entangled state with a high degree of symmetry is considered to be useful for overcoming a shot noise limit of Ramsey spectroscopy under some decoherence. This state is invariant under permutation of any two qubits and inversion between the… (More)

- Hiroo Azuma
- 2005

In this paper, we study decoherence in Grover’s quantum search algorithm using a perturbative method. We assume that each two-state system (qubit) that belongs to a register suffers a phase flip error (σz error) with probability p independently at every step in the algorithm, where 0 ≤ p ≤ 1. Considering an n-qubit density operator to which Grover’s… (More)

- Hiroo Azuma
- 2006

In this paper, we consider a method for implementing a quantum logic gate with photons whose wave function propagates in a one-dimensional Kerr-nonlinear photonic crystal. The photonic crystal causes the incident photons to undergo Bragg reflection by its periodic structure of dielectric materials and forms the photonic band structure, namely, the light… (More)

- Hiroo Azuma
- 2001

In this paper, we study decoherence on Grover’s quantum searching algorithm using a perturbative method. We assume that each two-state system (qubit) suffers σz error with probability p (0 ≤ p ≤ 1) independently at every step in the algorithm. Considering an n-qubit density operator to which Grover’s operation is applied M times, we expand it in powers of… (More)

- Hiroo Azuma
- 2004

In this paper, we consider a quantum algorithm for solving the following problem: “Suppose f is a function given as a black box (that is also called an oracle) and f is invariant under some AND-mask. Examine a property of f by querying the oracle.” We compare the efficiency of our quantum algorithm with that of classical algorithms by evaluating the… (More)

- Hiroo Azuma
- 2003

In this paper, we study how to generate entanglement by interaction-free measurement. Using Kwiat et al.’s interferometer, we construct a two-qubit quantum gate that changes a particle’s trajectory according to the other particle’s trajectory. We propose methods for generating the Bell state from an electron and a positron and from a pair of photons by this… (More)

- Hiroo Azuma, Masashi Ban
- 2008

In this paper, we write down the separable Werner state in a two-qubit system as a convex combination of product states explicitly. The Werner state in a two-qubit system has a single real parameter and varies from inseparable state to separable state according to the value of its parameter. The convex combination of product states gives a hidden variable… (More)

- Nobuya Kusunoki, Y Iwainaka, +7 authors Ichiro Koni
- Nihon Naika Gakkai zasshi. The Journal of the…
- 1994

- Hiroo Azuma
- 1998

How to build partially entangled states defined with functions whose all collisions are even are discussed. These states include a partially entangled state with a high degree of symmetry that is invariant under permutation of any two qubits and inversion between the ground state |0〉 and an excited state |1〉 for each qubit. An optimized high symmetric… (More)