Quantum algorithm for preparing the ground state of a system via resonance transition

  title={Quantum algorithm for preparing the ground state of a system via resonance transition},
  author={Hefeng Wang},
  journal={Scientific Reports},
  • Hefeng Wang
  • Published 27 June 2017
  • Physics
  • Scientific Reports
Preparing the ground state of a system is an important task in physics. We propose a quantum algorithm for preparing the ground state of a physical system that can be simulated on a quantum computer. The system is coupled to an ancillary qubit, by introducing a resonance mechanism between the ancilla qubit and the system, and combined with measurements performed on the ancilla qubit, the system can be evolved to monotonically converge to its ground state through an iterative procedure. We have… 
5 Citations
Quantum digital cooling
We introduce a method for digital preparation of ground states of a simulated Hamiltonians, inspired by cooling in nature and adapted to leverage the capabilities of digital quantum hardware. The
Metropolis-style random sampling of quantum gates for the estimation of low-energy observables
We propose a quantum algorithm to compute low-energy expectation values of a quantum Hamiltonian by sampling a partition function associated with the average energy of that Hamiltonian. For any given
Metropolis-style random sampling of quantum gates to estimate low-energy observables
In many areas of physics, we are often interested in calculating observables when the physical system is in, or is around, its lowest energy state. One particularly difficult problem of this nature
Engineered Dissipation for Quantum Information Science
Quantum information processing relies on precise control of non-classical states in the presence of many uncontrolled environmental degrees of freedom—requiring careful orchestration of how the


Algorithmic Cooling of a Quantum Simulator
Controlled quantum mechanical devices provide a means of simulating more complex quantum systems exponentially faster than classical computers. Such "quantum simulators" rely heavily upon being able
The 2D AKLT state is a universal quantum computational resource
Quantum computation promises exponential speedup over classical computation by exploiting the quantum mechanical nature of physical processes [1]. In addition to the standard circuit models,
Quantum algorithm for simulating the dynamics of an open quantum system
In the study of open quantum systems, one typically obtains the decoherence dynamics by solving a master equation. The master equation is derived using knowledge of some basic properties of the
Quantum algorithm for obtaining the energy spectrum of a physical system
We present a polynomial-time quantum algorithm for obtaining the energy spectrum of a physical system, i.e. the differences between the eigenvalues of the system's Hamiltonian, provided that the
Universal quantum computer from a quantum magnet
We show that a local Hamiltonian of spin-(3/2) particles with only two-body nearest-neighbor Affleck-Kennedy-Lieb-Tasaki and exchange-type interactions has a unique ground state, which can be used to
Experimental implementation of heat-bath algorithmic cooling using solid-state nuclear magnetic resonance
It is demonstrated the repeated repolarization of a particular qubit to an effective spin-bath temperature, and alternating logical operations within the three-qubit subspace to ultimately cool a second qubit below this temperature, an important step forward in the manipulation of solid-state nuclear magnetic resonance qubits.
A one-way quantum computer.
A scheme of quantum computation that consists entirely of one-qubit measurements on a particular class of entangled states, the cluster states, which are thus one-way quantum computers and the measurements form the program.
Optical one-way quantum computing with a simulated valence-bond solid
One-way quantum computing requires an entangled multiqubit system. So-called cluster states have been proposed to provide this resource, but they are difficult to generate. An alternative that uses
Quantum computation and quantum-state engineering driven by dissipation
In quantum information science, dissipation is commonly viewed as an adverse effect that destroys information through decoherence. But theoretical work shows that dissipation can be used to drive
Demon-like algorithmic quantum cooling and its realization with quantum optics
A universal pseudo-cooling method based on a Maxwell-demon-like swapping sequence is proposed. A controlled Hamiltonian gate is used to identify lower energy states of the system and to drive the