Marta P. Estarellas
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View article: Reinforcement Learning Based Quantum Circuit Optimization via ZX-Calculus
Reinforcement Learning Based Quantum Circuit Optimization via ZX-Calculus Open
We propose a novel Reinforcement Learning (RL) method for optimizing quantum circuits using graph-theoretic simplification rules of ZX-diagrams. The agent, trained using the Proximal Policy Optimization (PPO) algorithm, employs Graph Neura…
View article: Scalable 2-local architecture for quantum annealing of Ising models with arbitrary dimensions
Scalable 2-local architecture for quantum annealing of Ising models with arbitrary dimensions Open
Achieving densely connected hardware graphs is a challenge for most quantum computing platforms today, and a particularly crucial one for the case of quantum annealing applications. In this context, we present a scalable architecture for q…
View article: Quasi-Perfect state transfer in spin chains via parametrization of on-site energies
Quasi-Perfect state transfer in spin chains via parametrization of on-site energies Open
In recent years, significant progress has been made in the field of state transfer in spin chains, with the aim of achieving perfect state transfer for quantum information processing applications. Previous research has mainly focused on ma…
View article: Quasi-Perfect State Transfer in Spin Chains via Parametrization of On-Site Energies
Quasi-Perfect State Transfer in Spin Chains via Parametrization of On-Site Energies Open
In recent years, significant progress has been made in the field of state transfer in spin chains, with the aim of achieving perfect state transfer for quantum information processing applications. Previous research has mainly focused on ma…
View article: Harnessing Quantum Extreme Learning Machines for image classification
Harnessing Quantum Extreme Learning Machines for image classification Open
Interest in quantum machine learning is increasingly growing due to its potential to offer more efficient solutions for problems that are difficult to tackle with classical methods. In this context, the research work presented here focuses…
View article: Quantum simulation of one-dimensional fermionic systems with Ising Hamiltonians
Quantum simulation of one-dimensional fermionic systems with Ising Hamiltonians Open
In recent years, analog quantum simulators have reached unprecedented quality, both in qubit numbers and coherence times. Most of these simulators natively implement Ising-type Hamiltonians, which limits the class of models that can be sim…
View article: Scalable Quantum Spin Networks from Unitary Construction
Scalable Quantum Spin Networks from Unitary Construction Open
Spin network (SN) systems can be used to achieve quantum state transfer with high fidelity and to generate entanglement. A new approach to design spin‐chain‐based spin network systems, for short‐range quantum information processing and pha…
View article: Reinforcement Learning Based Quantum Circuit Optimization via ZX-Calculus
Reinforcement Learning Based Quantum Circuit Optimization via ZX-Calculus Open
We propose a novel Reinforcement Learning (RL) method for optimizing quantum circuits using graph-theoretic simplification rules of ZX-diagrams. The agent, trained using the Proximal Policy Optimization (PPO) algorithm, employs Graph Neura…
View article: Bounding first-order quantum phase transitions in adiabatic quantum computing
Bounding first-order quantum phase transitions in adiabatic quantum computing Open
In the context of adiabatic quantum computation (AQC), it has been argued that first-order quantum phase transitions (QPTs) due to localization phenomena cause AQC to fail by exponentially decreasing the minimal spectral gap of the Hamilto…
View article: Unitary Design of Quantum Spin Networks for Robust Routing, Entanglement Generation, and Phase Sensing
Unitary Design of Quantum Spin Networks for Robust Routing, Entanglement Generation, and Phase Sensing Open
Adv. Quantum Technol. 2022, 5, 2200013 DOI: 10.1002/qute.202200013 In the original published article the simulations of the effects of diagonal disorder incorrectly contained a factor of (1/2). This weakened the effects of diagonal errors,…
View article: Scalable Quantum Spin Networks from Unitary Construction
Scalable Quantum Spin Networks from Unitary Construction Open
Spin network systems can be used to achieve quantum state transfer with high fidelity and to generate entanglement. A new approach to design spin-chain-based spin network systems, for shortrange quantum information processing and phase-sen…
View article: Bounding first-order quantum phase transitions in adiabatic quantum computing
Bounding first-order quantum phase transitions in adiabatic quantum computing Open
In the context of adiabatic quantum computation (AQC), it has been argued that first-order quantum phase transitions (QPTs) due to localisation phenomena cause AQC to fail by exponentially decreasing the minimal spectral gap of the Hamilto…
View article: Unitary Design of Quantum Spin Networks for Robust Routing, Entanglement Generation, and Phase Sensing
Unitary Design of Quantum Spin Networks for Robust Routing, Entanglement Generation, and Phase Sensing Open
Spin chains can be used to describe a wide range of platforms for quantum computation and quantum information. They enable the understanding, demonstration, and modeling of numerous useful phenomena, such as high fidelity transfer of quant…
View article: Steered quantum annealing: improving time efficiency with partial information
Steered quantum annealing: improving time efficiency with partial information Open
In the computational model of quantum annealing, the size of the minimum gap between the ground state and the first excited state of the system is of particular importance, since it is inversely proportional to the running time of the algo…
View article: Quantum reservoir computation utilising scale-free networks
Quantum reservoir computation utilising scale-free networks Open
Today's quantum processors composed of fifty or more qubits have allowed us to enter a computational era where the output results are not easily simulatable on the world's biggest supercomputers. What we have not seen yet, however, is whet…
View article: Dephasing-induced growth of discrete time-crystalline order in spin networks
Dephasing-induced growth of discrete time-crystalline order in spin networks Open
A quantum phase of matter can be understood from the symmetry of the system's Hamiltonian. The system symmetry along the time axis has been proposed to show a new phase of matter referred as discrete-time crystals (DTCs). A DTC is a quantu…
View article: Quantum metamorphism
Quantum metamorphism Open
Crystals form regular and robust structures that under extreme conditions can\nmelt and recrystallize into different arrangements in a process that is called\ncrystal metamorphism. While crystals exist due to the breaking of a continuous\n…
View article: Simulating complex quantum networks with time crystals
Simulating complex quantum networks with time crystals Open
A graph-theoretic approach to characterize discrete time crystals and use them as a complex quantum network simulator.
View article: Comparison of entangling protocols in ABC-type spin chains
Comparison of entangling protocols in ABC-type spin chains Open
In this contribution we consider an advantageous building block with potential for various quantum applications: a device based on coupled spins capable of generating and sharing out an entangled pair of qubits. Our model device is a dimer…
View article: Efficient compression of quantum braided circuits
Efficient compression of quantum braided circuits Open
Mapping a quantum algorithm to any practical large-scale quantum computer will require a sequence of compilations and optimizations. At the level of fault-tolerant encoding, one likely requirement of this process is the translation into a …
View article: Rapid and Robust generation and distribution of EPR pairs with Spin Chains
Rapid and Robust generation and distribution of EPR pairs with Spin Chains Open
We investigate the ability of dimerized spin chains with defects to generate EPR pairs to very high fidelity through their natural dynamics. We propose two protocols based on different initializations of the system, and yielding the same m…
View article: Robust quantum entanglement generation and generation-plus-storage protocols with spin chains
Robust quantum entanglement generation and generation-plus-storage protocols with spin chains Open
Reliable quantum communication/processing links between modules are a\nnecessary building block for various quantum processing architectures. Here we\nconsider a spin chain system with alternating strength couplings and containing\nthree d…
View article: Anderson localisation in spin chains for perfect state transfer
Anderson localisation in spin chains for perfect state transfer Open
\n Anderson localisation is an important phenomenon arising in many areas of physics, and\n here we explore it in the context of quantum information devices. Finite dimensional spin\n chains have been demonstrated to be important devices f…