Modeling full adder in Ising spin quantum computer with 1000 qubits using quantum maps

The quantum adder is an essential attribute of a quantum computer, just as classical adder is needed for operation of a digital computer. We model the quantum full adder as a realistic complex algorithm on a large number of qubits in an Ising-spin quantum computer. Our results are an important step...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2004-03
Main Authors: Kamenev, D I, Berman, G P, Kassman, R B, Tsifrinovich, V I
Format: Article
Language:English
Subjects:
Adding circuits
Algorithms
Differential equations
Digital computers
Gates
Ising model
Logic circuits
Modelling
Phase error
Quantum computers
Quantum theory
Qubits (quantum computing)
Superposition (mathematics)
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The quantum adder is an essential attribute of a quantum computer, just as classical adder is needed for operation of a digital computer. We model the quantum full adder as a realistic complex algorithm on a large number of qubits in an Ising-spin quantum computer. Our results are an important step toward effective modeling of the quantum modular adder which is needed for Shor's and other quantum algorithms. Our full adder has the following features: (i) The near-resonant transitions with small detunings are completely suppressed, which allows us to decrease errors by several orders of magnitude and to model a 1000-qubit full adder. (We add a 1000-bit number using 2001 spins.) (ii) We construct the full adder gates directly as sequences of radio-frequency pulses, rather than breaking them down into generalized logical gates, such as Control-Not and one qubit gates. This substantially reduces the number of pulses needed to implement the full adder. [The maximum number of pulses required to add one bit (F-gate) is 15]. (iii) Full adder is realized in a homogeneous spin chain. (iv) The phase error is minimized: the F-gates generate approximately the same phase for different states of the superposition. (v) Modeling of the full adder is performed using quantum maps instead of differential equations. This allows us to reduce the calculation time to a reasonable value.
ISSN:2331-8422