Schedules Archives - IEEE Transactions on Quantum Engineering

Postprocessing Variationally Scheduled Quantum Algorithm for Constrained Combinatorial Optimization Problems

March 13, 2024Tatsuhiko Shirai, Nozomu TogawaQuantum ComputingAnnealing, Computational modeling, Logic gates, Quantum algorithm, Quantum annealing, Quantum computing, Schedules

In this article, we propose a postprocessing variationally scheduled quantum algorithm (pVSQA) for solving constrained combinatorial optimization problems (COPs). COPs are typically transformed into ground-state search problems of the Ising model on a quantum annealer or gate-based quantum device. Variational methods are used to find an optimal schedule function that leads to high-quality solutions in […]

Pulse-Engineered Controlled-V Gate and Its Applications on Superconducting Quantum Device

November 2, 2022Takahiko SatohOpen Access, Quantum ComputingLogic gates, Microwave circuits, Quantum algorithm, Quantum computing, Qubit, Schedules, Superconducting microwave devices

In this article, we demonstrate that, by employing the OpenPulse design kit for IBM superconducting quantum devices, the controlled-V gate ( cv gate) can be implemented in about half the gate time to the controlled-X gate ( cx or cnot gate) and consequently 65.5% reduced gate time compared to the cx -based implementation of cv […]

Deep Space Network Scheduling Using Quantum Annealing

November 2, 2022Alexandre GuillaumeOpen Access, Quantum ComputingAnnealing, Optimal scheduling, Optimization, Processor scheduling, Quantum annealing, Qubit, Schedules

The National Aeronautics and Space Administration’s (NASA) Deep Space Network (DSN) is responsible for communication and navigation for several NASA and international missions. The DSN comprises three complexes located in Goldstone (California, USA), Cambera (Australia), and Madrid (Spain). This distribution in longitude guarantees a full sky coverage. Each complex has one 70-m and several 34-m […]

Experimental Demonstrations of Native Implementation of Boolean Logic Hamiltonian in a Superconducting Quantum Annealer

August 24, 2021Daisuke Saida; Yuki Yamanashi; Mutsuo Hidaka; Fuminori Hirayama; Kentaro Imafuku; Shuichi Nagasawa; Shiro KawabataOpen Access, Quantum Computer Architecture, Quantum InformationAnnealing, Electronics packaging, Licenses, Logic gates, Qubit, Schedules, Superconducting integrated circuits

Experimental demonstrations of quantum annealing with “native” implementation of Boolean logic Hamiltonians are reported. As a superconducting integrated circuit, a problem Hamiltonian whose set of ground states is consistent with a given truth table is implemented for quantum annealing with no redundant qubits. As examples of the truth table, nand and nor are successfully fabricated […]