REVIEW 4 cited by
Quantum communication in a superposition of causal orders
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
Signed reviews
read the original abstract
Quantum mechanics allows for situations where the relative order between two processes is entangled with a quantum degree of freedom. Here we show that such entanglement can enhance the ability to transmit quantum information over noisy communication channels. We consider two completely dephasing channels, which in normal conditions are unable to transmit any quantum information. We show that, when the two channels are traversed in an indefinite order, a quantum bit sent through them has a 25% probability to reach the receiver without any error. For partially dephasing channels, a similar advantage takes place deterministically: the amount of quantum information that can travel through two channels in a superposition of orders can be larger than the amount of quantum information that can travel through each channel individually.
Forward citations
Cited by 4 Pith papers
-
Probabilistic Channel Distillation via Indefinite Causal Order
Second-order superswitches can probabilistically distil any qubit Pauli channel into the identity channel, and noisier channels actually give higher distillation rates.
-
Polycategorical Constructions for Unitary Supermaps of Arbitrary Dimension
Defines polyslot pslot[C] and srep[C] constructions on symmetric monoidal categories that reconstruct unitary supermaps and forbid time-loops in composition, with equivalence shown on path-contraction groupoids.
-
Probabilistic exact universal quantum circuits for transforming unitary operations
The paper derives optimal success probabilities and no-go thresholds for probabilistically transforming unknown unitary operations into their transpose, complex conjugate, or inverse, and proves adaptive circuits give...
-
Surpassing the Global Heisenberg Limit Using a High-effciency Quantum Switch
A 50.6%-efficient photonic quantum switch yields geometric-phase precision below the global Heisenberg limit without postselection, for n=29,30 displacement pairs.
Discussion (0). Continue with ORCID to comment.