Aditya Locharla
A5067922374- Quantum Computing Algorithms and Architecture
- Quantum Information and Cryptography
- Advancements in Semiconductor Devices and Circuit Design
- Quantum and electron transport phenomena
- Quantum many-body systems
- Neural Networks and Reservoir Computing
- Semiconductor materials and devices
- Quantum Mechanics and Applications
- Advanced Data Storage Technologies
- Quantum optics and atomic interactions
- Ultrasonics and Acoustic Wave Propagation
- Theoretical and Computational Physics
- Neural Networks and Applications
- Low-power high-performance VLSI design
- Topological Materials and Phenomena
- Non-Destructive Testing Techniques
- Photonic Crystals and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Computational Geometry and Mesh Generation
- Complex Network Analysis Techniques
- Physics of Superconductivity and Magnetism
- Algebraic structures and combinatorial models
- Computational Physics and Python Applications
- Quantum-Dot Cellular Automata
- Quantum, superfluid, helium dynamics
Google (United States)
2021-2025
University of California, Riverside
2022
Abstract Practical quantum computing will require error rates well below those achievable with physical qubits. Quantum correction 1,2 offers a path to algorithmically relevant by encoding logical qubits within many qubits, for which increasing the number of enhances protection against errors. However, introducing more also increases sources, so density errors must be sufficiently low performance improve code size. Here we report measurement qubit scaling across several sizes, and...
The discovery of topological order has revolutionized the understanding quantum matter in modern physics and provided theoretical foundation for many error correcting codes. Realizing topologically ordered states proven to be extremely challenging both condensed synthetic systems. Here, we prepare ground state toric code Hamiltonian using an efficient circuit on a superconducting processor. We measure entanglement entropy near expected value $\ln2$, simulate anyon interferometry extract...
Abstract Quantum many-body systems display rich phase structure in their low-temperature equilibrium states 1 . However, much of nature is not thermal equilibrium. Remarkably, it was recently predicted that out-of-equilibrium can exhibit novel dynamical phases 2–8 may otherwise be forbidden by thermodynamics, a paradigmatic example being the discrete time crystal (DTC) 7,9–15 Concretely, defined periodically driven many-body-localized (MBL) via concept eigenstate order 7,16,17 In...
Indistinguishability of particles is a fundamental principle quantum mechanics
Engineered dissipative reservoirs have the potential to steer many-body quantum systems toward correlated steady states useful for simulation of high-temperature superconductivity or magnetism. Using up 49 superconducting qubits, we prepared low-energy transverse-field Ising model through coupling auxiliary qubits. In one dimension, observed long-range correlations and a ground-state fidelity 0.86 18 qubits at critical point. two dimensions, found mutual information that extends beyond...
Inherent symmetry of a quantum system may protect its otherwise fragile states. Leveraging such protection requires testing robustness against uncontrolled environmental interactions. Using 47 superconducting qubits, we implement the one-dimensional kicked Ising model which exhibits non-local Majorana edge modes (MEMs) with $\mathbb{Z}_2$ parity symmetry. Remarkably, find that any multi-qubit Pauli operator overlapping MEMs uniform late-time decay rate comparable to single-qubit relaxation...
Systems of correlated particles appear in many fields modern science and represent some the most intractable computational problems nature. The challenge these systems arises when interactions become comparable to other energy scales, which makes state each particle depend on all particles1. lack general solutions for three-body problem acceptable theory strongly electrons shows that our understanding fades number or interaction strength increases. One hallmarks interacting is formation...
Abstract An important measure of the development quantum computing platforms has been simulation increasingly complex physical systems. Before fault-tolerant computing, robust error-mitigation strategies were necessary to continue this growth. Here, we validate recently introduced that exploit expectation ideal output a algorithm would be pure state. We consider task simulating electron systems in seniority-zero subspace where all electrons are paired with their opposite spin. This affords...
We demonstrate a high dynamic range Josephson parametric amplifier (JPA) in which the active nonlinear element is implemented using an array of rf-SQUIDs. The device matched to 50 Ω environment with Klopfenstein-taper impedance transformer and achieves bandwidth 250–300 MHz input saturation powers up −95 dBm at 20 dB gain. A 54-qubit Sycamore processor was used benchmark these devices, providing calibration for readout power, estimation added noise, platform comparison against standard...
The error rates of quantum devices are orders magnitude higher than what is needed to run most applications. To close this gap, Quantum Error Correction (QEC) encodes logical qubits and distributes information using several physical qubits. By periodically executing a syndrome extraction circuit on the qubits, about errors (called syndrome) extracted while running programs. A decoder uses these syndromes identify correct in real time, which necessary prevent accumulation errors....
Practical quantum computing will require error rates that are well below what is achievable with physical qubits. Quantum correction offers a path to algorithmically-relevant by encoding logical qubits within many qubits, where increasing the number of enhances protection against errors. However, introducing more also increases sources, so density errors must be sufficiently low in order for performance improve code size. Here, we report measurement qubit scaling across multiple sizes, and...
Engineered dissipative reservoirs have the potential to steer many-body quantum systems toward correlated steady states useful for simulation of high-temperature superconductivity or magnetism. Using up 49 superconducting qubits, we prepared low-energy transverse-field Ising model through coupling auxiliary qubits. In one dimension, observed long-range correlations and a ground-state fidelity 0.86 18 qubits at critical point. two dimensions, found mutual information that extends beyond...
Abstract Measurement has a special role in quantum theory 1 : by collapsing the wavefunction it can enable phenomena such as teleportation 2 and thereby alter "arrow of time" that constrains unitary evolution. When integrated many-body dynamics, measurements lead to emergent patterns information space-time 3-10 go beyond established paradigms for characterizing phases, either or out equilibrium 11-13 . On present-day NISQ processors 14 , experimental realization this physics is challenging...
Leakage of quantum information out computational states into higher energy represents a major challenge in the pursuit error correction (QEC). In QEC circuit, leakage builds over time and spreads through multi-qubit interactions. This leads to correlated errors that degrade exponential suppression logical with scale, challenging feasibility as path towards fault-tolerant computation. Here, we demonstrate execution distance-3 surface code distance-21 bit-flip on Sycamore processor where is...
The error rates of quantum devices are orders magnitude higher than what is needed to run most applications. To close this gap, Quantum Error Correction (QEC) encodes logical qubits and distributes information using several physical qubits. By periodically executing a syndrome extraction circuit on the qubits, about errors (called syndrome) extracted while running programs. A decoder uses these syndromes identify correct in real time, which required use feedback implemented algorithms....
Indistinguishability of particles is a fundamental principle quantum mechanics. For all elementary and quasiparticles observed to date - including fermions, bosons, Abelian anyons this guarantees that the braiding identical leaves system unchanged. However, in two spatial dimensions, an intriguing possibility exists: non-Abelian causes rotations space topologically degenerate wavefunctions. Hence, it can change observables without violating indistinguishability. Despite well developed...
Measurement has a special role in quantum theory: by collapsing the wavefunction it can enable phenomena such as teleportation and thereby alter "arrow of time" that constrains unitary evolution. When integrated many-body dynamics, measurements lead to emergent patterns information space-time go beyond established paradigms for characterizing phases, either or out equilibrium. On present-day NISQ processors, experimental realization this physics is challenging due noise, hardware...
Inherent symmetry of a quantum system may protect its otherwise fragile states. Leveraging such protection requires testing robustness against uncontrolled environmental interactions. Using 47 superconducting qubits, we implement the one-dimensional kicked Ising model which exhibits non-local Majorana edge modes (MEMs) with $\mathbb{Z}_2$ parity symmetry. Remarkably, find that any multi-qubit Pauli operator overlapping MEMs uniform late-time decay rate comparable to single-qubit relaxation...
We demonstrate a high dynamic range Josephson parametric amplifier (JPA) in which the active nonlinear element is implemented using an array of rf-SQUIDs. The device matched to 50 $Ω$ environment with Klopfenstein-taper impedance transformer and achieves bandwidth 250-300 MHz, input saturation powers up -95 dBm at 20 dB gain. A 54-qubit Sycamore processor was used benchmark these devices, providing calibration for readout power, estimate added noise, platform comparison against standard...