On Simultaneous Information and Energy Transmission through Quantum Channels

The optimal rate at which information can be sent through a quantum channel when the transmitted signal must simultaneously carry some minimum amount of energy is characterized. To do so, we introduce the quantum-classical analogue of the capacity-power function and generalize results in classical information theory for transmitting classical information through noisy channels. We show that the capacity-power function for a quantum channel, for both unassisted and private protocol, is concave and also prove additivity for unentangled and uncorrelated ensembles of input signals. This implies we do not need regularized formulas for calculation. We numerically demonstrate these properties for some standard channel models. We obtain analytical expressions for the capacity-power function for the case of noiseless channels using properties of random quantum states and concentration phenomenon in large Hilbert spaces.Comment: 13 pages, 16 figure

Laparoscopic and open transhiatal oesophagectomy for corrosive stricture of the oesophagus: An experience

Background: Oesophagectomy for corrosive stricture of the oesophagus (CSE) is rarely performed due to high risk of iatrogenic complications. The aims of this study were to review our experience of transhiatal oesophagectomy (THE) in patients with CSE as well as to compare results of open and laparoscopic methods. Materials and Methods: This is a retrospective analysis of prospectively maintained data of patients with CSE who underwent open transhiatal oesophagectomy (OTE) or laparoscopic-assisted transhiatal oesophagectomy (LATE) by a single surgical team from 2012 to 2016. All study patients had either failed endoscopic dilatation or had a long stricture which was not amenable to endoscopic dilatation. Results: Totally, 35 patients were included in the study, of which 19 (54.3%) were female. OTE was performed in 20 (57%) patients, and LATE was performed in 15 (43%) patients. Gastric and colonic conduits were used in 23 (65.7%) and 10 (34.3%) patients, respectively. Demographic and clinical parameters were comparable between LATE and OTE groups (P > 0.05). Median intra-operative blood loss, post-operative requirement of analgesic and hospital stay were lower in LATE group (P ≤ 0.05). There was no hospital mortality (30 days), but three patients (8.6%) died during a median follow-up of 36 months. Conclusion: THE is a safe procedure for patients with CSE, and LATE may be an alternative approach in selected patients

Thoracoscopic oesophagectomy for end-stage achalasia

Achalasia cardia is an oesophageal motility disorder characterised by aperistalsis and failure of relaxation of the lower oesophageal sphincter. The management is predominantly palliative with focus on addressing the sphincter that involves either pneumatic dilatation or Heller myotomy which relieves dysphagia in the majority of the cases. End-stage achalasia (ESA) is characterised by failed myotomy, massively dilated and tortuous oesophagus with nutritional deterioration due to progressive dysphagia and vomiting. In these subgroups of patients, oesophagectomy may be the last resort. While oesophagectomy has been described for ESA before, thoracoscopic oesophagectomy has not been reported previously. Hereby, we report our experience of performing minimally invasive oesophagectomy (thoracoscopic) with the gastric pull-up

Early recurrence after laparoscopic radical cholecystectomy in a patient with gallbladder cancer

Laparoscopic radical cholecystectomy for gallbladder cancer (GBC) has been performed at various oncology centres reporting its technical feasibility. Considering GBC an aggressive malignancy, laparoscopic radical cholecystectomy should be dealt with caution. We recently encountered a case of carcinoma gallbladder who underwent laparoscopic radical cholecystectomy elsewhere and presented with early recurrence. The patient's records were evaluated and he underwent re-resection. Hereby, we discuss the factors that could lead to early recurrence after laparoscopic radical cholecystectomy and measures that can be taken to prevent it

Histopathological pattern of endometrium in infertility patient: One year prospective study in tertiary care center of rural India

Infertility is defined as difficulty in conceiving children after regular and unprotected coitus for at least one year. Many investigative measures are available now a day to identify the cause of infertility so clinician can assess the chance of achieving pregnancy in couples. Morphology of endometrium is very useful indicator of ovarian function. Our study aims to see the different pattern of endometrium histologically in female infertility patient. We tried to assess the significance anovulatory cycle and incidence of tuberculous endometritis. Study was done in pathology department of UPUMS, Saifai, Etawah. Eighty-four (84) cases of primary and secondary infertility were included in this study. Endometrial biopsy tissues were processed and stained with hematoxylin and eosin stain according to the standard procedure. Out of 84 cases 48(57%) were of primary infertility and 36 (42.85%) were of secondary infertility. Majority of the infertility patient fell in age group of 21 to 30 years. Out of 84 cases 42 (50%) cases showed proliferative endometrium and 33(39.2%) cases showed secretory endometrium. Tuberculous endometritis seen in 2 (2.3%) cases. In present study percentage of anovulatory endometrium was 52.5%, endometrial biopsy is cost-effective, safe and efficient diagnostic tool in cases of both primary and secondary infertility