Abstract: Systems and techniques that facilitate expectation value calculation by grouping Pauli-strings are provided. In various embodiments, a system can comprise an expectation component that calculate expectation values of two Pauli-strings based on a first bit series of a first Pauli-string of the two Pauli-strings and a second bit series of a second Pauli-string of the two Pauli-strings, wherein bit series comprise a first value for a position of an x or y in a Pauli string and a second value for a position of a non-x or y in the Pauli-string.

Abstract: Methods and apparatuses for designing quantum circuits include generating a Pauli graph from Pauli strings in a qubit Hamiltonian. Nodes are merged in the Pauli graph, responsive to a determination that some Pauli strings are observables that are jointly measurable by entangled measurement. A quantum circuit based is generated on a merged Pauli graph that results from merging the nodes.

Abstract: VQE is accelerated by performing receiving a qubit Hamiltonian representing a linear combination of a plurality of Pauli strings. Selecting, among the plurality of Pauli strings, one or more Pauli strings that have less influence than a threshold on an eigenvalue of the qubit Hamiltonian. Grouping, based on joint measurability, the unselected Pauli strings among the plurality of Pauli strings into a plurality of groups of jointly measurable Pauli strings Determining that one or more of the selected one or more Pauli strings is jointly measurable with Pauli strings in one of the plurality of groups And adding one or more of the selected one or more Pauli strings to the one of the plurality of groups.

Abstract: Systems, computer-implemented methods, and computer program products to facilitate sampling-optimization for gate-level simulations are provided. According to an embodiment, a system can comprise a processor that executes computer executable components stored in memory. The computer executable components comprise a cache component that caches a state of a set of qubits within a quantum gate-level simulation after the set of qubits are reset. According to another embodiment the computer executable components further comprise an avoidance component that prevents duplicated simulation of quantum gates in the quantum gate-level simulation by using the cached state of the set of qubits to represent a quantum state produced by a previously simulated quantum gate.

Abstract: VQE is accelerated by performing receiving a qubit Hamiltonian representing a linear combination of a plurality of Pauli strings. Selecting, among the plurality of Pauli strings, one or more Pauli strings that have less influence than a threshold on an eigenvalue of the qubit Hamiltonian. Grouping, based on joint measurability, the unselected Pauli strings among the plurality of Pauli strings into a plurality of groups of jointly measurable Pauli strings Determining that one or more of the selected one or more Pauli strings is jointly measurable with Pauli strings in one of the plurality of groups And adding one or more of the selected one or more Pauli strings to the one of the plurality of groups.

Abstract: VQE is accelerated by performing receiving a qubit Hamiltonian representing a linear combination of a plurality of Pauli strings. Selecting, among the plurality of Pauli strings, one or more Pauli strings that have less influence than a threshold on an eigenvalue of the qubit Hamiltonian. Grouping, based on joint measurability, the unselected Pauli strings among the plurality of Pauli strings into a plurality of groups of jointly measurable Pauli strings Determining that one or more of the selected one or more Pauli strings is jointly measurable with Pauli strings in one of the plurality of groups And adding one or more of the selected one or more Pauli strings to the one of the plurality of groups.

Abstract: VQE is accelerated by performing receiving a qubit Hamiltonian representing a linear combination of a plurality of Pauli strings. Selecting, among the plurality of Pauli strings, one or more Pauli strings that have less influence than a threshold on an eigenvalue of the qubit Hamiltonian. Grouping, based on joint measurability, the unselected Pauli strings among the plurality of Pauli strings into a plurality of groups of jointly measurable Pauli strings Determining that one or more of the selected one or more Pauli strings is jointly measurable with Pauli strings in one of the plurality of groups And adding one or more of the selected one or more Pauli strings to the one of the plurality of groups.

Abstract: Methods and apparatuses for designing quantum circuits include generating a Pauli graph from Pauli strings in a qubit Hamiltonian. Nodes are merged in the Pauli graph, responsive to a determination that some Pauli strings are observables that are jointly measurable by entangled measurement. A quantum circuit based is generated on a merged Pauli graph that results from merging the nodes.

Abstract: Methods and apparatuses for designing quantum circuits include obtaining Pauli strings included in a qubit Hamiltonian. At least some of the strings are grouped, based at least partially on a judgment of whether Pauli strings are observables that are jointly measurable by entangled measurement, at least at some operators. A quantum circuit is designed based on a result obtained from the grouping.

Abstract: VQE is accelerated by performing receiving a qubit Hamiltonian representing a linear combination of a plurality of Pauli strings. Selecting, among the plurality of Pauli strings, one or more Pauli strings that have less influence than a threshold on an eigenvalue of the qubit Hamiltonian. Grouping, based on joint measurability, the unselected Pauli strings among the plurality of Pauli strings into a plurality of groups of jointly measurable Pauli strings Determining that one or more of the selected one or more Pauli strings is jointly measurable with Pauli strings in one of the plurality of groups And adding one or more of the selected one or more Pauli strings to the one of the plurality of groups.

Abstract: Methods and apparatuses for designing quantum circuits include obtaining Pauli strings included in a qubit Hamiltonian. At least some of the strings are grouped, based at least partially on a judgment of whether Pauli strings are observables that are jointly measurable by entangled measurement, at least at some operators. A quantum circuit is designed based on a result obtained from the grouping.