Available States

struct DualRailMidSwapBell <: QuantumSavory.StatesZoo.AbstractTwoQubitState

Fields:

• eA: Link efficiencies for memory A upto the swap (include link loss, detector efficiency, etc.)

• eB: Link efficiencies for memory B upto the swap (include link loss, detector efficiency, etc.)

• gA: Memory initialization parameter for memory A

• gB: Memory initialization parameter for memory B

• Pd: Detector dark count probability per photonic mode (assumed to be the same for both detectors)

• Vis: Interferometer visibility for the midpoint swap

• metadata

Generates the normalized spin-spin density matrix for linear photonic entanglement swap with emissive memories emitting dual rail photonic qubits from the paper (Prajit Dhara and Guha, 2023).

julia> using QuantumSavory.StatesZoo: DualRailMidSwapBell

julia> r = Register(2);

julia> initialize!(r[1:2], DualRailMidSwapBell(0.9, 0.9, 0.5, 0.5, 1e-8, 0.99));

julia> observable(r[1:2], Z⊗Z)
-0.9999999911111113 + 0.0im

struct DualRailMidSwapBellW <: QuantumSavory.StatesZoo.AbstractTwoQubitState

Fields:

• eA: Link efficiencies for memory A upto the swap (include link loss, detector efficiency, etc.)

• eB: Link efficiencies for memory B upto the swap (include link loss, detector efficiency, etc.)

• gA: Memory initialization parameter for memory A

• gB: Memory initialization parameter for memory B

• Pd: Detector dark count probability per photonic mode (assumed to be the same for both detectors)

• Vis: Interferometer visibility for the midpoint swap

• metadata

Generates the unnormalized spin-spin density matrix for linear photonic entanglement swap with emissive memories emitting dual rail photonic qubits from the paper (Prajit Dhara and Guha, 2023). Since the matrix is 'weighted' by the probability for success, it is suffixed with a W to distinguish it from the normalized object DualRailMidSwapBell.

julia> using QuantumSavory.StatesZoo: DualRailMidSwapBellW

julia> r = Register(2);

julia> initialize!(r[1:2], DualRailMidSwapBellW(0.9, 0.9, 0.5, 0.5, 1e-8, 0.99));

julia> observable(r[1:2], Z⊗Z)
-0.10124999595000005 + 0.0im

struct SingleRailMidSwapBell <: QuantumSavory.StatesZoo.AbstractTwoQubitState

Fields:

• eA: Link efficiencies for memory A upto the swap (include link loss, detector efficiency, etc.)

• eB: Link efficiencies for memory B upto the swap (include link loss, detector efficiency, etc.)

• gA: Memory initialization parameter for memory A

• gB: Memory initialization parameter for memory B

• Pd: Detector dark count probability per photonic mode (assumed to be the same for both detectors)

• Vis: Interferometer visibility for the midpoint swap' can be complex to account for phase instability

• metadata

Generates the normalized spin-spin density matrix for linear photonic entanglement swap with emissive memories emitting single rail photonic qubits from the paper (Prajit Dhara and Guha, 2023)

julia> using QuantumSavory.StatesZoo: SingleRailMidSwapBell

julia> r = Register(2);

julia> initialize!(r[1:2], SingleRailMidSwapBell(0.9, 0.9, 0.5, 0.5, 1e-8, 0.99));

julia> observable(r[1:2], Z⊗Z)
-0.8181818000000001 + 0.0im

struct SingleRailMidSwapBellW <: QuantumSavory.StatesZoo.AbstractTwoQubitState

Fields:

• eA: Link efficiencies for memory A upto the swap (include link loss, detector efficiency, etc.)

• eB: Link efficiencies for memory B upto the swap (include link loss, detector efficiency, etc.)

• gA: Memory initialization parameter for memory A

• gB: Memory initialization parameter for memory B

• Pd: Detector dark count probability per photonic mode (assumed to be the same for both detectors)

• Vis: Interferometer visibility for the midpoint swap' can be complex to account for phase instability

• metadata

Generates the unnormalized spin-spin density matrix for linear photonic entanglement swap with emissive memories emitting single rail photonic qubits from the paper (Prajit Dhara and Guha, 2023). Since the matrix is 'weighted' by the probability for success, it is suffixed with a W to distinguish it from the normalized object SingleRailMidSwapBell.

julia> using QuantumSavory.StatesZoo: SingleRailMidSwapBellW

julia> r = Register(2);

julia> initialize!(r[1:2], SingleRailMidSwapBellW(0.9, 0.9, 0.5, 0.5, 1e-8, 0.99));

julia> observable(r[1:2], Z⊗Z)
-0.202499993925 + 0.0im

struct ZALMSpinPair <: QuantumSavory.StatesZoo.AbstractTwoQubitState

Fields:

• Ns: mean photon number per mode of the cascaded source model

• gA: qubit initialization parameter on Alice's side

• gB: qubit initialization parameter on Bob's side

• eAm: memory out-coupling efficiency for Alice's side (Allowed range: [0,1])

• eBm: memory out-coupling efficiency for Bob's side (Allowed range: [0,1])

• eAs: source out-coupling efficiency for Alice's side (Allowed range: [0,1])

• eBs: source out-coupling efficiency for Bob's side (Allowed range: [0,1])

• eD: detector efficiency (Allowed range: [0,1])

• Pd: dark click probability per photonic mode on source's swap

• Pdo1: dark click probability per photonic mode on Alice side swap

• Pdo2: dark click probability per photonic mode on Bob side swap

• VisF: product of visibilities of all three interferometers (Allowed range: [0,1])

• metadata

Generate symbolic object for the normalized spin-spin density matrix for a cascaded source swapped with emissive spin memories. The cascaded source from papers (and Guha, 2022) and (and Englund, 2023) is stored in spin memories as discussed in (Prajit Dhara and Guha, 2023).

julia> using QuantumSavory.StatesZoo: ZALMSpinPair

julia> r = Register(2);

julia> initialize!(r[1:2], ZALMSpinPair(1e-3, 0.5, 0.5, 1, 1, 1, 1, 0.9, 1e-8, 1e-8, 1e-8, 0.99));

julia> observable(r[1:2], Z⊗Z)
-0.9999999911111112 + 0.0im

struct ZALMSpinPairW <: QuantumSavory.StatesZoo.AbstractTwoQubitState

Fields:

• Ns: mean photon number per mode of the cascaded source model

• gA: qubit initialization parameter on Alice's side

• gB: qubit initialization parameter on Bob's side

• eAm: memory out-coupling efficiency for Alice's side (Allowed range: [0,1])

• eBm: memory out-coupling efficiency for Bob's side (Allowed range: [0,1])

• eAs: source out-coupling efficiency for Alice's side (Allowed range: [0,1])

• eBs: source out-coupling efficiency for Bob's side (Allowed range: [0,1])

• eD: detector efficiency (Allowed range: [0,1])

• Pd: dark click probability per photonic mode on source's swap

• Pdo1: dark click probability per photonic mode on Alice side swap

• Pdo2: dark click probability per photonic mode on Bob side swap

• VisF: product of visibilities of all three interferometers (Allowed range: [0,1])

• metadata

Generate symbolic object for the unnormalized spin-spin density matrix for a cascaded source swapped with emissive spin memories. Since the matrix is 'weighted' by the probability for success, it is suffixed with a W to distinguish it from the normalized object ZALMSpinPair. The cascaded source from papers (and Guha, 2022) and (and Englund, 2023) is stored in spin memories as discussed in (Prajit Dhara and Guha, 2023).

julia> using QuantumSavory.StatesZoo: ZALMSpinPairW

julia> r = Register(2);

julia> initialize!(r[1:2], ZALMSpinPairW(1e-3, 0.5, 0.5, 1, 1, 1, 1, 0.9, 1e-8, 1e-8, 1e-8, 0.99));

julia> observable(r[1:2], Z⊗Z)
-6.290288032211147e-9 + 0.0im