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arXiv:2202.00248 · IEEE International Symposium on Information Theory (ISIT)

Entanglement-Assisted Quantum Error-Correcting Codes over Local Frobenius Rings

Tania Sidana, Navin Kashyap

Published Jun 26, 2022• 4 citations
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Abstract

In this paper, we provide a framework for constructing entanglement-assisted quantum error-correcting codes (EAQECCs) from classical additive codes over a finite commutative local Frobenius ring. We give a formula for the minimum number of entanglement qudits required to construct an EAQECC from an additive code over a finite Galois ring. This significantly extends known results for EAQECCs over finite fields.

DOI
10.1109/isit50566.2022.9834381

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In this paper, we provide a framework for constructing entanglement-assisted quantum error-correcting codes (EAQECCs) from classical additive codes over a finite commutative local Frobenius ring. We give a formula for the minimum number of entanglement qudits required to construct an EAQECC from an additive code over a finite Galois ring. This significantly extends known results for EAQECCs over finite fields.
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We introduce a construction for entanglement-assisted quantum error-correcting codes (EAQECCs) that saturates the classical Singleton bound with less shared entanglement than any known method for code rates below $ \frac{k}{n} = \frac{1}{3} $. For higher rates, our EAQECC also meets the Singleton bound, although with increased entanglement requirements. Additionally, we demonstrate that any classical [n,k,d]q[n,k,d]_q[n,k,d]q​ code can be transformed into an EAQECC with parameters [[n,k,d;2k]]q[[n,k,d;2k]]_q[[n,k,d;2k]]q​ using 2k2k2k pre-shared maximally entangled pairs. The complexity of our encoding protocol for kkk-qudits with qqq levels is O(klog⁡qq−1(k))\mathcal{O}(k \log_{\frac{q}{q-1}}(k))O(klogq−1q​​(k)), excluding the complexity of encoding and decoding the classical MDS code. While this complexity remains linear in kkk for systems of reasonable size, it increases significantly for larger-levelled systems, highlighting the need for further research into complexity reduction.
Entanglement-assisted quantum error-correcting codes (EAQECCs) make use of preexisting entanglement between the sender and receiver to boost the rate of transmission. It is possible to construct an EAQECC from any classical linear code, unlike standard QECCs, which can only be constructed from dual-containing codes. Operator quantum error-correcting codes allow certain errors to be corrected (or prevented) passively, reducing the complexity of the correction procedure. We combine these two extensions of standard quantum error correction into a unified entanglement-assisted quantum error-correction formalism. This new scheme, which we call entanglement-assisted operator quantum error correction (EAOQEC), is the most general and powerful quantum error-correcting technique known, retaining the advantages of both entanglement-assistance and passive correction. We present the formalism, show the considerable freedom in constructing EAOQECCs from classical codes, and demonstrate the construction with examples.
The entanglement-assisted (EA) formalism generalizes the standard stabilizer formalism. All quaternary linear codes can be transformed into entanglement-assisted quantum error correcting codes (EAQECCs) under this formalism. In this work, we discuss construction of EAQECCs from Hermitian non-dual containing primitive Bose–Chaudhuri–Hocquenghem (BCH) codes over the Galois field GF(4). By a careful analysis of the cyclotomic cosets contained in the defining set of a given BCH code, we can determine the optimal number of ebits that needed for constructing EAQECC from this BCH code, rather than calculate the optimal number of ebits from its parity check matrix, and derive a formula for the dimension of this BCH code. These results make it possible to specify parameters of the obtained EAQECCs in terms of the design parameters of BCH codes.