From 1fef726728a14cc923c7cbaf80d337b4eb35db3c Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Sat, 6 Dec 2025 20:59:32 +0100
Subject: [fix]: rounding errors and fancy printing

---
 libpsi-core/src/core/circuit.rs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'libpsi-core/src/core')

diff --git a/libpsi-core/src/core/circuit.rs b/libpsi-core/src/core/circuit.rs
index 293d509..eb64aaf 100644
--- a/libpsi-core/src/core/circuit.rs
+++ b/libpsi-core/src/core/circuit.rs
@@ -1,5 +1,5 @@
 use super::{QuantumGate, QuantumRegister, QuantumState};
-use crate::Vector;
+use crate::{format_amplitude, format_probability, Vector};
 use core::fmt;
 
 #[derive(Clone)]
@@ -211,9 +211,23 @@ impl<'a> fmt::Display for QuantumCircuit<'a> {
             let amp = state.get(i);
             if amp.real.abs() > 1e-10 || amp.imaginary.abs() > 1e-10 {
                 let basis: String = format!("{:0width$b}", i, width = self.num_qubits());
-                writeln!(f, "  |{}⟩: {:.4}", basis, amp)?;
+                writeln!(f, "  |{}⟩: {}", basis, format_amplitude(&amp))?;
             }
         }
         Ok(())
     }
 }
+
+impl<'a> QuantumCircuit<'a> {
+    pub fn print_probabilities(&self) {
+        let probs = self.probabilities();
+        let n = self.num_qubits();
+        println!("Probabilities:");
+        for (i, p) in probs.iter().enumerate() {
+            if *p > 1e-10 {
+                let basis: String = format!("{:0width$b}", i, width = n);
+                println!("  |{}⟩: {}", basis, format_probability(*p));
+            }
+        }
+    }
+}
-- 
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