remove untested code: JET detected errors in this code, probably due …

…to the use of np.exp which seems to have been copied from python's numpy -- as this code is not used or tested I just deleted it

src/BPGates.jl

@@ -679,33 +679,6 @@ function NoisyBellSwap(idx1,idx2,px,py,pz)
     return PauliNoiseBellGate(BellSwap(idx1,idx2), px,py,pz)
 end
 
-function thermal_relaxation_error(t1::Float64, t2::Float64, gate_time::Float64) # experimental private function for internal use
-    λ₁ = 1 - np.exp(-gate_time/t1)
-    t_ϕ = t1*t2 / (2*t1 - t2)
-    λ₂ = 1 - np.exp(-gate_time/t_ϕ)
-    return λ₁, λ₂
-end
-
-# TODO this function does not add thermal noise to the "wait" times in between gates on the qubits that are not acted upon on the current timestep
-function add_thermal_relaxation(circuit, λ₁::Float64, λ₂::Float64) # experimental private function for intenral use
-    thermal_noisy_circuit = []
-    for gate in circuit
-        push!(thermal_noisy_circuit, gate)   # apply the original gate
-        if gate isa PauliNoiseBellGate{CNOTPerm} || gate isa PauliNoiseBellGate{BellSwap} # TODO we should not have such non-general type checks -- this should be using multimethods in order to be extendable
-            # For two-qubit gates, attach T1 and T2 noise on both qubits
-            push!(thermal_noisy_circuit, T1NoiseOp(gate.g.idx1, λ₁))
-            push!(thermal_noisy_circuit, T2NoiseOp(gate.g.idx1, λ₂))
-            push!(thermal_noisy_circuit, T1NoiseOp(gate.g.idx2, λ₁))
-            push!(thermal_noisy_circuit, T2NoiseOp(gate.g.idx2, λ₂))
-        # elseif gate isa NoisyBellMeasureNoisyReset
-        else
-            # No thermal relaxation added to measurements
-            continue
-        end
-    end
-    return thermal_noisy_circuit
-end
-
 
 ##############################
 # Random