Documentation
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Overview ¶
Package ansatz provides parameterized circuit templates for variational algorithms.
Index ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type Ansatz ¶
type Ansatz interface {
// Circuit returns the parameterized circuit.
Circuit() (*ir.Circuit, error)
// NumParams returns the number of free parameters.
NumParams() int
// ParamVector returns the parameter vector used by the circuit.
ParamVector() *param.Vector
}
Ansatz is a parameterized quantum circuit template.
type BasicEntanglerLayers ¶
type BasicEntanglerLayers struct {
// contains filtered or unexported fields
}
BasicEntanglerLayers is an ansatz with single-parameter rotation layers and a CNOT ring entanglement pattern. Each layer applies RX(theta) on every qubit followed by a circular CNOT entangling layer. The circuit has numQubits*layers parameters.
func NewBasicEntanglerLayers ¶
func NewBasicEntanglerLayers(numQubits, layers int) *BasicEntanglerLayers
NewBasicEntanglerLayers creates a BasicEntanglerLayers ansatz.
func (*BasicEntanglerLayers) Circuit ¶
func (be *BasicEntanglerLayers) Circuit() (*ir.Circuit, error)
func (*BasicEntanglerLayers) NumParams ¶
func (be *BasicEntanglerLayers) NumParams() int
func (*BasicEntanglerLayers) ParamVector ¶
func (be *BasicEntanglerLayers) ParamVector() *param.Vector
type EfficientSU2 ¶
type EfficientSU2 struct {
// contains filtered or unexported fields
}
EfficientSU2 is an ansatz with RY+RZ rotation layers and CNOT entanglement. The circuit has 2*numQubits*(reps+1) parameters.
func NewEfficientSU2 ¶
func NewEfficientSU2(numQubits, reps int, ent Entanglement) *EfficientSU2
NewEfficientSU2 creates an EfficientSU2 ansatz.
func (*EfficientSU2) NumParams ¶
func (es *EfficientSU2) NumParams() int
func (*EfficientSU2) ParamVector ¶
func (es *EfficientSU2) ParamVector() *param.Vector
type Entanglement ¶
type Entanglement int
Entanglement describes the entangling layer pattern.
const ( // Linear applies CNOT between adjacent qubits: (0,1), (1,2), ... Linear Entanglement = iota // Full applies CNOT between all pairs. Full // Circular extends Linear with an additional (n-1, 0) CNOT. Circular )
type RealAmplitudes ¶
type RealAmplitudes struct {
// contains filtered or unexported fields
}
RealAmplitudes is an ansatz with RY rotation layers and CNOT entanglement. The circuit has numQubits*(reps+1) parameters.
func NewRealAmplitudes ¶
func NewRealAmplitudes(numQubits, reps int, ent Entanglement) *RealAmplitudes
NewRealAmplitudes creates a RealAmplitudes ansatz.
func (*RealAmplitudes) NumParams ¶
func (ra *RealAmplitudes) NumParams() int
func (*RealAmplitudes) ParamVector ¶
func (ra *RealAmplitudes) ParamVector() *param.Vector
type StronglyEntanglingLayers ¶
type StronglyEntanglingLayers struct {
// contains filtered or unexported fields
}
StronglyEntanglingLayers is an ansatz with Rot(phi, theta, omega) rotation layers and a shifted CNOT entanglement pattern. Each layer uses 3 parameters per qubit and a CNOT offset that cycles through 1, 2, ..., numQubits-1. The circuit has 3*numQubits*layers parameters.
func NewStronglyEntanglingLayers ¶
func NewStronglyEntanglingLayers(numQubits, layers int) *StronglyEntanglingLayers
NewStronglyEntanglingLayers creates a StronglyEntanglingLayers ansatz.
func (*StronglyEntanglingLayers) Circuit ¶
func (s *StronglyEntanglingLayers) Circuit() (*ir.Circuit, error)
func (*StronglyEntanglingLayers) NumParams ¶
func (s *StronglyEntanglingLayers) NumParams() int
func (*StronglyEntanglingLayers) ParamVector ¶
func (s *StronglyEntanglingLayers) ParamVector() *param.Vector
type UCCSD ¶
type UCCSD struct {
// contains filtered or unexported fields
}
UCCSD is a Unitary Coupled-Cluster Singles and Doubles ansatz for quantum chemistry. It implements the Jordan-Wigner-mapped UCCSD circuit, consisting of a Hartree-Fock reference state followed by fermionic single and double excitation operators.
The parameter vector is ordered as [singles..., doubles...], but the circuit applies doubles before singles (matching PennyLane's convention).
func NewUCCSD ¶
NewUCCSD creates a UCCSD ansatz for the given number of spin-orbitals (qubits) and electrons.
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