Research Publications Archive

The latest in Quantum Thinking

Entanglement across separate silicon dies in a modular superconducting qubit device

We demonstrate a modular solid state architecture with deterministic inter-module coupling between four physically separate, interchangeable superconducting qubit integrated circuits.

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Systems R&D 23.11.20

Implementation of XY entangling gates with a single calibrated pulse

Novel implementation of XY(θ) unlocks a new family of entangling gates.

Algorithms & Applications 09.11.20

Estimating expectation values using approximate quantum states

We test the proposed method on Rigetti's quantum processor unit and find an excellent agreement with the theory, despite experimental errors.

Algorithms & Applications 20.08.20

Finding the optimal Nash equilibrium in a discrete Rosenthal congestion game using the Quantum Alternating Operator Ansatz

We establish the tractability of finding the optimal Nash equilibrium to a discrete congestion game using a gate-model quantum computer.

Systems R&D 07.07.20

An open-source, industrial-strength optimizing compiler for quantum programs

We describe many of the principles behind Quilc's design, and demonstrate the compiler with various examples.

Algorithms & Applications 27.02.20

Quanvolutional neural networks: powering image recognition with quantum circuits

We introduce a new type of transformational layer called a quantum convolution, or quanvolutional layer.

Systems R&D 14.01.20

A quantum-classical cloud platform optimized for variational hybrid algorithms

We enumerate the architectural requirements of a quantum-classical cloud platform, and present a framework for benchmarking its runtime performance.

Algorithms & Applications 27.12.19

Quantum logic gate synthesis as a Markov Decision Process

We investigate the feasibility of the assumption that a variety of tasks in quantum programming could be modeled as Markov Decision Processes by exploring its consequences for two of the simplest tasks in quantum programming: state preparation and gate compilation.

Systems R&D 09.12.19

Methods for measuring magnetic flux crosstalk between tunable transmons

We present three measurements that directly quantify the DC and AC flux crosstalk present between tunable transmons.

Algorithms & Applications 13.11.19

Portfolio rebalancing experiments using the Quantum Alternating Operator Ansatz

Experimental analysis demonstrates the potential tractability of this application on NISQ hardware.

Algorithms & Applications 23.10.19

An approximate description of quantum states

We introduce an approximate description of an N--qubit state, which contains sufficient information to estimate the expectation value of any observable with precision.

Systems R&D 29.08.19

Assessing the influence of broadband instrumentation noise on parametrically modulated superconducting qubits

Low-pass filtering the AC signal used to drive two-qubit gates between the first and second harmonic frequencies can reduce qubit sensitivity to flux noise at the AC sweet spot.

Algorithms & Applications 21.08.19

Automated quantum programming via reinforcement learning for combinatorial optimization

Agents trained through RL techniques are capable of producing short quantum programs with high quality solutions.

Displaying 49–60 of 73 results