Iftach Yakar
@quantumyakar.bsky.social
Quantum computing + information | Computer science | postgraduate @ HUJI
All tacos are sandwiches - trivial by definition.
All sandwiches are tacos - can you prove it, or is it a conjecture? I think it should be easily falsifiable.
All sandwiches are tacos - can you prove it, or is it a conjecture? I think it should be easily falsifiable.
November 16, 2025 at 5:03 PM
All tacos are sandwiches - trivial by definition.
All sandwiches are tacos - can you prove it, or is it a conjecture? I think it should be easily falsifiable.
All sandwiches are tacos - can you prove it, or is it a conjecture? I think it should be easily falsifiable.
Someone driving an electron-sized car gets pulled over by a cop.
Cop: do you know how fast you were going?
Driver: yes… but thanks to you, now I have no idea where I am.
Cop: do you know how fast you were going?
Driver: yes… but thanks to you, now I have no idea where I am.
November 16, 2025 at 5:01 PM
Someone driving an electron-sized car gets pulled over by a cop.
Cop: do you know how fast you were going?
Driver: yes… but thanks to you, now I have no idea where I am.
Cop: do you know how fast you were going?
Driver: yes… but thanks to you, now I have no idea where I am.
"Hi look, someone made a movie after the meme!"
October 20, 2025 at 9:22 PM
"Hi look, someone made a movie after the meme!"
The outage happened while I was listening to one of your episodes with an Amazon software engineer 😃
October 20, 2025 at 9:17 PM
The outage happened while I was listening to one of your episodes with an Amazon software engineer 😃
October 10, 2025 at 7:20 PM
🔗 Interactive results: deduckproject.github.io/global-epp-r...
📄 Paper: arxiv.org/abs/2510.06737
Big thanks to my advisor, Michael Ben-Or, for being patient and giving thorough explanations on everything.
8/8
📄 Paper: arxiv.org/abs/2510.06737
Big thanks to my advisor, Michael Ben-Or, for being patient and giving thorough explanations on everything.
8/8
Advantages of Global Entanglement-Distillation Policies in Quantum Repeater Chains
Quantum repeaters are essential for achieving long-distance quantum communication due to photon loss, which grows exponentially with the channel distance. Current quantum repeater generations use enta...
arxiv.org
October 10, 2025 at 6:58 PM
🔗 Interactive results: deduckproject.github.io/global-epp-r...
📄 Paper: arxiv.org/abs/2510.06737
Big thanks to my advisor, Michael Ben-Or, for being patient and giving thorough explanations on everything.
8/8
📄 Paper: arxiv.org/abs/2510.06737
Big thanks to my advisor, Michael Ben-Or, for being patient and giving thorough explanations on everything.
8/8
🛰️ Global policies can crucially extend achievable QKD distances.
Local policies may not be optimal in real repeater networks.
Since these global policies are deterministic, they have no real-time overhead.
Next steps: adaptive policies or other EPPs.
7/8
Local policies may not be optimal in real repeater networks.
Since these global policies are deterministic, they have no real-time overhead.
Next steps: adaptive policies or other EPPs.
7/8
October 10, 2025 at 6:58 PM
🛰️ Global policies can crucially extend achievable QKD distances.
Local policies may not be optimal in real repeater networks.
Since these global policies are deterministic, they have no real-time overhead.
Next steps: adaptive policies or other EPPs.
7/8
Local policies may not be optimal in real repeater networks.
Since these global policies are deterministic, they have no real-time overhead.
Next steps: adaptive policies or other EPPs.
7/8
For large chains (>500 repeaters), global policies boost SKR by two orders of magnitude.
In some regimes, they make secret communication possible when local ones yield none.
6/8
In some regimes, they make secret communication possible when local ones yield none.
6/8
October 10, 2025 at 6:58 PM
For large chains (>500 repeaters), global policies boost SKR by two orders of magnitude.
In some regimes, they make secret communication possible when local ones yield none.
6/8
In some regimes, they make secret communication possible when local ones yield none.
6/8
We take a *global* view: optimize distillation across the entire chain to maximize SKR.
By randomly sampling global policies, we find "near-optimal" policies that consistently outperform the local ones, for given parameters.
5/8
By randomly sampling global policies, we find "near-optimal" policies that consistently outperform the local ones, for given parameters.
5/8
October 10, 2025 at 6:58 PM
We take a *global* view: optimize distillation across the entire chain to maximize SKR.
By randomly sampling global policies, we find "near-optimal" policies that consistently outperform the local ones, for given parameters.
5/8
By randomly sampling global policies, we find "near-optimal" policies that consistently outperform the local ones, for given parameters.
5/8
Recent protocols (e.g. Mantri et al. 2024, arXiv:2409.06152) use *local* policies - each repeater decides whether to distill based on local information (like estimated fidelity or Secret Key Rate - SKR)
4/8
4/8
October 10, 2025 at 6:58 PM
Recent protocols (e.g. Mantri et al. 2024, arXiv:2409.06152) use *local* policies - each repeater decides whether to distill based on local information (like estimated fidelity or Secret Key Rate - SKR)
4/8
4/8
All this introduces noise, which can be mitigated through entanglement distillation (EPP): turning many noisy EPR pairs into fewer, high-fidelity ones.
The question is: when to distill?
Too early - we waste good EPR pairs; Too late - noise kills us.
3/8
The question is: when to distill?
Too early - we waste good EPR pairs; Too late - noise kills us.
3/8
October 10, 2025 at 6:58 PM
All this introduces noise, which can be mitigated through entanglement distillation (EPP): turning many noisy EPR pairs into fewer, high-fidelity ones.
The question is: when to distill?
Too early - we waste good EPR pairs; Too late - noise kills us.
3/8
The question is: when to distill?
Too early - we waste good EPR pairs; Too late - noise kills us.
3/8
Quantum communication over large distances is hard due to photon loss, which grows exponentially with distance. Quantum repeaters solve this by dividing the channel into short segments, entangling neighbors, and recursively performing entanglement-swapping.
2/8
2/8
October 10, 2025 at 6:58 PM
Quantum communication over large distances is hard due to photon loss, which grows exponentially with distance. Quantum repeaters solve this by dividing the channel into short segments, entangling neighbors, and recursively performing entanglement-swapping.
2/8
2/8
Hate these.. probably better off spraying, though, at this stage of infestation
September 7, 2025 at 7:26 PM
Hate these.. probably better off spraying, though, at this stage of infestation