31 research outputs found
Cluster state generation in one-dimensional Kitaev honeycomb model via shortcut to adiabaticity
We propose a mean to obtain computationally useful resource states also known
as cluster states, for measurement-based quantum computation, via
transitionless quantum driving algorithm. The idea is to cool the system to its
unique ground state and tune some control parameters to arrive at
computationally useful resource state, which is in one of the degenerate ground
states. Even though there is set of conserved quantities already present in the
model Hamiltonian, which prevents the instantaneous state to go to any other
eigenstate subspaces, one cannot quench the control parameters to get the
desired state. In that case, the state will not evolve. With involvement of the
shortcut Hamiltonian, we obtain cluster states in fast-forward manner. We
elaborate our proposal in the one-dimensional Kitaev honeycomb model, and show
that the auxillary Hamiltonian needed for the counterdiabatic driving is of
M-body interaction.Comment: 13 pages, 3 figures. Added detailed derivation to arrive at the
shortcut Hamiltonian plus numerical simulations. Invited manuscript to be
appeared in Focus on Shortcuts to Adiabaticity, NJP (IOP
Measurement-Based Quantum Computation on Two-Body Interacting Qubits with Adiabatic Evolution
A cluster state cannot be a unique ground state of a two-body interacting
Hamiltonian. Here, we propose the creation of a cluster state of logical qubits
encoded in spin-1/2 particles by adiabatically weakening two-body interactions.
The proposal is valid for any spatial dimensional cluster states. Errors
induced by thermal fluctuations and adiabatic evolution within finite time can
be eliminated ensuring fault-tolerant quantum computing schemes.Comment: title updated, introduction and discussions sections update
SKIRTING AROUND THE NO-GO THEOREM IN MEASUREMENT-BASED QUANTUM COMPUTATION
Master'sMASTER OF SCIENC
Floquet stroboscopic divisibility in non-Markovian dynamics
We provide a general discussion of the Liouvillian spectrum for a system
coupled to a non-Markovian bath using Floquet theory. This approach is suitable
when the system is described by a time-convolutionless master equation with
time-periodic rates. Surprisingly, the periodic nature of rates allow us to
have a stroboscopic divisible dynamical map at discrete times, which we refer
to as Floquet stroboscopic divisibility. We illustrate the general theory for a
Schr\"odinger cat which is roaming inside a non-Markovian bath, and demonstrate
the appearance of stroboscopic revival of the cat at later time after its
death. Our theory may have profound implications in entropy production in
non-equilibrium systems.Comment: We changed the title and explained in more detail the definition of
non-Markovian dynamics used in the manuscrip
Quantum computer-aided design of quantum optics hardware
The parameters of a quantum system grow exponentially with the number of involved quantum particles. Hence, the associated memory requirement to store or manipulate the underlying wavefunction goes well beyond the limit of the best classical computers for quantum systems composed of a few dozen particles, leading to serious challenges in their numerical simulation. This implies that the verification and design of new quantum devices and experiments are fundamentally limited to small system size. It is not clear how the full potential of large quantum systems can be exploited. Here, we present the concept of quantum computer designed quantum hardware and apply it to the field of quantum optics. Specifically, we map complex experimental hardware for high-dimensional, many-body entangled photons into a gate-based quantum circuit. We show explicitly how digital quantum simulation of Boson sampling experiments can be realized. We then illustrate how to design quantum-optical setups for complex entangled photonic systems, such as high-dimensional Greenberger–Horne–Zeilinger states and their derivatives. Since photonic hardware is already on the edge of quantum supremacy and the development of gate-based quantum computers is rapidly advancing, our approach promises to be a useful tool for the future of quantum device design
Mutual information-assisted Adaptive Variational Quantum Eigensolver
Adaptive construction of ansatz circuits offers a promising route towards
applicable variational quantum eigensolvers (VQE) on near-term quantum
hardware. Those algorithms aim to build up optimal circuits for a certain
problem. Ansatz circuits are adaptively constructed by selecting and adding
entanglers from a predefined pool in those algorithms. In this work, we propose
a way to construct entangler pools with reduced size for those algorithms by
leveraging classical algorithms. Our method uses mutual information (MI)
between the qubits in classically approximated ground state to rank and screen
the entanglers. The density matrix renormalization group (DMRG) is employed for
classical precomputation in this work. We corroborate our method numerically on
small molecules. Our numerical experiments show that a reduced entangler pool
with a small portion of the original entangler pool can achieve same numerical
accuracy. We believe that our method paves a new way for adaptive construction
of ansatz circuits for variational quantum algorithms.Comment: 8 pages, 11 figure
Quantum computer-aided design of quantum optics hardware
The parameters of a quantum system grow exponentially with the number of involved quantum particles. Hence, the associated memory requirement to store or manipulate the underlying wavefunction goes well beyond the limit of the best classical computers for quantum systems composed of a few dozen particles, leading to serious challenges in their numerical simulation. This implies that the verification and design of new quantum devices and experiments are fundamentally limited to small system size. It is not clear how the full potential of large quantum systems can be exploited. Here, we present the concept of quantum computer designed quantum hardware and apply it to the field of quantum optics. Specifically, we map complex experimental hardware for high-dimensional, many-body entangled photons into a gate-based quantum circuit. We show explicitly how digital quantum simulation of Boson sampling experiments can be realized. We then illustrate how to design quantum-optical setups for complex entangled photonic systems, such as high-dimensional Greenberger–Horne–Zeilinger states and their derivatives. Since photonic hardware is already on the edge of quantum supremacy and the development of gate-based quantum computers is rapidly advancing, our approach promises to be a useful tool for the future of quantum device design
Investigation of Japanese Encephalitis Virus Infection in Bogalay Township, Myanmar in 1999
An investigation was in Nyi-naung-wa village, Bogalay township for Japanese encephalitis (JE) virus infection and the possibility of a JE outbreak. JE virus antibody was determined among the pigs and the people living near the pig farms in that village and at an adjacent village as a control. The known JE virus vector Culex mosquito species were also identified in both villages. Haemagglutination inhibition (HAI) methods were used for the detectioon of JE and dengue antibodies. Homotypic or monotypic JE antibodies were detected in 33% of the pigs tested. No homotypic nor monotypic JE antibodis was detected among the villagers. Although there was no JE virus infection among the people, because of the presence of JE virus infection among the pigs and the presence of Culex mosquito vector in that area, the possibility of a JE outbreak in humans in that area, if the number of pig breeding per household increase and the mosquito density become higher is discussed